Some of the best HF propagation of Solar Cycle 25 is likely on Thursday,
Friday and Saturday; however, propagation crossing the auroral ovals
and polar regions is likely to be slightly degraded during local nighttime
hours from midday Friday until midday Saturday.
HF propagation crossing mid and low latitudes is likely to be normal on
Thursday, Friday and Saturday.
The 2200Z Wednesday Penticton 10.7 cm observed solar flux index was 193 .
The 2249Z Wednesday SILSO Estimated International Sunspot Number (EISN) was 157.
6 meter F2 propagation is unlikely until TEP season begins in March.
Long path propagation from North America to south and southeast east Asia
on 80 through 10 meters is likely to be normal on Thursday, Friday and Saturday.
This forecast derived from today 's NOAA/SWPC web pages and 15 other online sources (the URLs at the end of this forecast) is published five days a week (M-F) in The Daily DX .
All days and times in this forecast are in UTC (Zulu) time.
6 meter F2 propagation is unlikely until TEP season begins in March. 6 meter sporadic-E propagation beyond 2200 km is expected to be very infrequent, very short duration and very unreliable until March but could occur without warning.
The visible solar disk has one growing large active region, two decaying medium active regions and five small active regions. There are 69 sunspots on the visible disk with a total sunspot area of 990 micro-solar hemispheres (about six times the surface area of the Earth).
Solar wind velocity is likely to remain at about 400 km/second or less on Thursday, increasing at about 400 km/second or more on Friday and Saturday.
Mostly quiet geomagnetic conditions are likely on Thursday, Friday and Saturday; however, mostly unsettled geomagnetic conditions are likely from before midday Friday until midday Saturday.
Propagation crossing polar, auroral. mid and low latitude regions is likely to be on normal Thursday, Friday and Saturday; however, propagation crossing the auroral ovals and polar regions is likely to be slightly degraded during local nighttime hours from midday Friday until midday Saturday.
There is a slight chance that S1-class minor solar energetic particle radiation storms may slightly degrade propagation crossing polar regions on Thursday, Friday and Saturday.
M-class solar flares are expected to cause brief periods of minor blackouts of propagation paths crossing the sunlit side of the Earth on Thursday, Friday and Saturday. There is a slight chance that X-class solar flares may cause about an hour of isolated radio blackouts of propagation paths crossing the sunlit side of the Earth on Thursday, Friday and Saturday.
160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be normal on Thursday, Friday and Saturday. 160 and 80 meter long distance propagation in the northern hemisphere is always mildly to moderately degraded by E region blanketing of low angle F2 propagation until sunset or later.
40 meter short path propagation from North America to the Middle East and south Asia after about 2200Z is likely to be normal on Thursday, mostly normal on Friday improving to normal on Saturday. Short path propagation between North America and east Asia after about 0800Z is likely to be mostly normal on Thursday, Friday and Saturday.
30 meter propagation crossing the auroral ovals and polar regions is likely to be normal on Thursday, Friday and Saturday but degrading to mostly normal during local nighttime hours from midday Friday through midday Saturday. 30 meter long distance propagation is always mildly to moderately degraded within several hours of local noon by E-region blanketing of low angle long distance F2 propagation.
20 meter propagation crossing the auroral ovals and polar regions is likely to be normal on Thursday, Friday and Saturday but degrading to mostly normal during local nighttime hours from midday Friday through midday Saturday.
17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be normal on Thursday, Friday and Saturday but degrading to mostly normal during local nighttime hours from midday Friday through midday Saturday. Long path propagation from North America to southeast and east Asia is likely to be normal on Thursday, Friday and Saturday.
12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be normal on Thursday, Friday and Saturday but degrading to mostly normal during local nighttime hours from midday Friday through midday Saturday. Long path propagation from North America to southeast and east Asia is likely to be normal on Thursday, Friday and Saturday.
6 meter F2 propagation is unlikely until TEP season begins in March. There is a slight chance of enhanced propagation crossing low latitudes from about 2000-0200Z during the initial phase of strong to severe geomagnetic storms then degrading several hours after initial enhancement.
Sustained southward orientation (-Bz) of the north-south component of the interplanetary magnetic field (IMF) plays a crucial but unpredictable role in triggering all geomagnetic storms. Brief minor to moderate geomagnetic
storms may be gradually triggered when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for at least a few hours coincident with the influence of a geoeffective coronal hole high speed stream or CME. More frequent, longer duration, minor to severe geomagnetic storms may be triggered suddenly and unpredictably when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for a period of several hours or more coincident with the influence of a geoeffective CME and solar wind speed of about 500 km/second or more.
Mid-latitude northern hemisphere sunrise is 14 minutes earlier and sunset is 47 minutes later than it was on December 21st. Sunrise is about two hours earlier and sunset is about two hours later at the altitude of the refracting F2 region. Sunrise is about one hour earlier, and sunset is about one hour later at the altitude of the daytime absorbing D region.
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Some of the best HF propagation of Solar Cycle 25 is likely on Wednesday, Thursday and Friday.
The 2200Z Tuesday Penticton 10.7 cm observed solar flux index was 210 .
The late Tuesday SILSO Estimated International Sunspot Number (EISN) was 166.
There is a slight chance of unreliable short duration 6 meter F2 propagation
during the next week as a result of ongoing increased sunspot activity.
6 meter F2 propagation is likely to become more frequent, more reliable
and longer in duration when TEP season begins in March.
HF propagation crossing polar and auroral regions is likely to be normal
on Wednesday, Thursday and Friday.
HF propagation crossing mid and low latitudes is likely to be normal
on Wednesday, Thursday and Friday.
Long path propagation from North America to south and southeast east Asia
on 80 through 10 meters is likely to be normal on Wednesday, Thursday and Friday.
The visible solar disk has one growing large active region, one growing medium active region, one stable medium active region and four small active regions. There are 104 sunspots on the visible disk with a total sunspot area of 1215 micro-solar hemispheres (about seven times the surface area of the Earth).
Solar wind velocity is likely remain at 400 km/second or less on Wednesday, Thursday and Friday.
Quiet geomagnetic conditions are likely on Wednesday, Thursday and Friday.
HF propagation crossing polar and auroral regions is likely to be normal on on Wednesday, Thursday and Friday.
There is a slight chance that S1-class minor solar energetic particle radiation storms may slightly degrade propagation crossing polar regions on Wednesday, Thursday and Friday.
M-class solar flares are expected to cause brief periods of minor blackouts of propagation paths crossing the sunlit side of the Earth on Wednesday, Thursday and Friday. There is a slight chance that X-class solar flares may cause about an hour of radio blackouts of propagation paths crossing the sunlit side of the Earth on Wednesday, Thursday and Friday.
160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be normal on Wednesday, Thursday and Friday. 160 and 80 meter long distance propagation in the northern hemisphere is always mildly to moderately degraded by E region blanketing of low angle F2 propagation until sunset or later.
40 meter short path propagation from North America to the Middle East and south Asia after about 2200Z is likely to be normal on Wednesday, Thursday and Friday. Short path propagation between North America and east Asia after about 0800Z is likely to be normal on Wednesday, Thursday and Friday.
30 meter propagation crossing the auroral ovals and polar regions is likely to be normal on Wednesday, Thursday and Friday.. 30 meter long distance propagation is always mildly to moderately degraded within several hours of local noon by E-region blanketing of low angle long distance F2 propagation.
20 meter propagation crossing the auroral ovals and polar regions is likely to be normal on Wednesday, Thursday and Friday.
17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be normal on Wednesday, Thursday and Friday. Long path propagation from North America to southeast and east Asia is likely to be normal on Wednesday, Thursday and Friday.
12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be normal on Wednesday, Thursday and Friday.. Long path propagation from North America to southeast and east Asia is likely to be normal on Wednesday, Thursday and Friday.
There is a slight chance of unreliable short duration 6 meter F2 propagation during the next week as a result of ongoing increased sunspot activity There is a slight chance of enhanced propagation crossing low latitudes from about 2000-0200Z during the initial phase of strong to severe geomagnetic storms then degrading several hours after initial enhancement.
Sustained southward orientation (-Bz) of the north-south component of the interplanetary magnetic field (IMF) plays a crucial but unpredictable role in triggering all geomagnetic storms. Brief minor to moderate geomagnetic
storms may be gradually triggered when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for at least a few hours coincident with the influence of a geoeffective coronal hole high speed stream or CME. More frequent, longer duration, minor to severe geomagnetic storms may be triggered suddenly and unpredictably when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for a period of several hours or more coincident with the influence of a geoeffective CME and solar wind speed of about 500 km/second or more.
Mid-latitude northern hemisphere sunrise is 13 minutes earlier and sunset is 46 minutes later than it was on December 21st. Sunrise is about two hours earlier and sunset is about two hours later at the altitude of the refracting F2 region. Sunrise is about one hour earlier, and sunset is about one hour later at the altitude of the daytime absorbing D region.
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The 2200Z Monday Penticton 10.7 cm observed solar flux index was 221 .
The early Tuesday SILSO Estimated International Sunspot Number (EISN) was 169.
There is a slight chance of unreliable short duration 6 meter F2 propagation
during the next week as a result of ongoing increased sunspot activity.
6 meter F2 propagation is likely to become more frequent, more reliable
and longer in duration when TEP season begins in March.
HF propagation crossing polar and auroral regions is likely to be
mostly normal on Tuesday and Wednesday improving to normal on Thursday.
HF propagation crossing mid and low latitudes is likely to be normal on Tuesday, Wednesday and Thursday.
Long path propagation from North America to south and southeast east Asia
on 80 through 10 meters is likely to be mostly normal on Tuesday
and Wednesday improving to normal on Thursday.
This forecast derived from today 's NOAA/SWPC web pages and 15 other online sources (the URLs at the end of this forecast) is published five days a week (M-F) in The Daily DX .
All days and times in this forecast are in UTC (Zulu) time.
There is a slight chance of unreliable short duration 6 meter F2 propagation during the next week as a result of ongoing increased sunspot activity. 6 meter F2 propagation is likely to become more frequent, more reliable and longer in duration when TEP season begins in March. 6 meter sporadic-E propagation beyond 2200 km is expected to be very infrequent, very short duration and very unreliable until March but could occur without warning.
The visible solar disk has one growing medium active region, three stable medium active regions and three small active regions. There are 76 sunspots on the visible disk with a total sunspot area of 890 micro-solar hemispheres (about five times the surface area of the Earth).
Solar wind velocity is likely to gradually decline to 400 km/second or less on Tuesday, Wednesday and Thursday.
Quiet to unsettled geomagnetic conditions are likely on Tuesday, mostly quiet conditions are likely on Wednesday and quiet conditions are likely on Thursday.
HF propagation crossing polar and auroral regions is likely to be mostly normal on Tuesday and Wednesday improving to normal on Thursday.
There is a slight chance that S1-class minor solar energetic particle radiation storms may slightly degrade propagation crossing polar regions on Tuesday, Wednesday and Thursday.
M-class solar flares are expected to cause brief periods of minor blackouts of propagation paths crossing the sunlit side of the Earth on Tuesday, Wednesday and Thursday. There is a slight chance that X-class solar flares may cause about an hour of radio blackouts of propagation paths crossing the sunlit side of the Earth on Tuesday, Wednesday and Thursday.
160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be normal on Tuesday, Wednesday and Thursday. 160 and 80 meter long distance propagation in the northern hemisphere is always mildly to moderately degraded by E region blanketing of low angle F2 propagation until sunset or later.
40 meter short path propagation from North America to the Middle East and south Asia after about 2200Z is likely to be mostly normal on Tuesday and normal on Wednesday and Thursday. Short path propagation between North America and east Asia after about 0800Z is likely to be mostly normal on Tuesday and Wednesday and normal on Thursday.
30 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Tuesday and Wednesday improving to normal on Thursday. 30 meter long distance propagation is always mildly to moderately degraded within several hours of local noon by E-region blanketing of low angle long distance F2 propagation.
20 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Tuesday and Wednesday improving to normal on Thursday.
17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Tuesday and Wednesday improving to normal on Thursday. Long path propagation from North America to southeast and east Asia is likely to mildly degraded until late Tuesday, improving to mostly normal on Tuesday and Wednesday improving to normal on Thursday.
12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Tuesday and Wednesday improving to normal on Thursday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal on Tuesday and Wednesday improving to normal on Thursday.
There is a slight chance of unreliable short duration 6 meter F2 propagation during the next week as a result of ongoing increased sunspot activity There is a slight chance of enhanced propagation crossing low latitudes from about 2000-0200Z during the initial phase of strong to severe geomagnetic storms then degrading several hours after initial enhancement.
Sustained southward orientation (-Bz) of the north-south component of the interplanetary magnetic field (IMF) plays a crucial but unpredictable role in triggering all geomagnetic storms. Brief minor to moderate geomagnetic
storms may be gradually triggered when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for at least a few hours coincident with the influence of a geoeffective coronal hole high speed stream or CME. More frequent, longer duration, minor to severe geomagnetic storms may be triggered suddenly and unpredictably when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for a period of several hours or more coincident with the influence of a geoeffective CME and solar wind speed of about 500 km/second or more.
Mid-latitude northern hemisphere sunrise is 12 minutes earlier and sunset is 44 minutes later than it was on December 21st. Sunrise is about two hours earlier and sunset is about two hours later at the altitude of the refracting F2 region. Sunrise is about one hour earlier, and sunset is about one hour later at the altitude of the daytime absorbing D region.
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The 2200Z Tuesday Penticton 10.7 cm observed solar flux index was 177 .
The early Thursday SILSO Estimated International Sunspot Number (EISN) was 96.
6 meter F2 propagation is unlikely until TEP season begins in March.
HF propagation crossing polar and auroral regions is likely to be
normal on Thursday, mostly normal on Friday and mildly degraded on Saturday.
HF propagation crossing mid latitudes is likely to be normal on Thursday,
mostly normal on Friday and mostly normal with mildly degraded periods Saturday
HF propagation crossing low latitudes is likely to be normal on Thursday,
Friday and Saturday.
Long path propagation from North America to south and southeast east Asia
on 80 through 10 meters is likely to be normal on Thursday, mostly normal
on Friday and mildly degraded on Saturday.
This forecast derived from today 's NOAA/SWPC web pages and 15 other online sources (the URLs at the end of this forecast) is published five days a week (M-F) in The Daily DX .
All days and times in this forecast are in UTC (Zulu) time.
6 meter F2 propagation is unlikely until TEP season begins in March.
6 meter sporadic-E propagation beyond 2200 km is expected to be very infrequent, very short duration and very unreliable until March but could occur without warning.
The 2200Z Tuesday Penticton 10.7 cm observed solar flux index was 177 .
The early Thursday SILSO Estimated International Sunspot Number was 96.
The visible solar disk has two growing medium active regions, one stable medium active region and two small active regions. There are 81 sunspots on the visible disk with a total sunspot area of 540 micro-solar hemispheres (about three times the surface area of the Earth).
Solar wind velocity is likely to be well below 400 km/second , then gradually increasing to above 400 km/second from late Friday through Saturday.
Quiet geomagnetic conditions are likely on Thursday, mostly quiet on Friday and quiet to unsettled with a chance of brief minor geomagnetic storm conditions on Saturday.
HF propagation crossing polar and auroral regions is likely to be normal on Thursday, mostly normal on Friday and mildly degraded on Saturday.
No S1-class minor solar energetic particle radiation storms that slightly degrade propagation crossing polar regions are expected through Saturday.
There is a chance that M-class solar flares may cause brief periods of minor blackouts of propagation paths crossing the sunlit side of the Earth on Thursday, Friday and Saturday. There is a slight chance that X-class solar flares may cause about an hour of radio blackouts of propagation paths crossing the sunlit side of the Earth on Thursday, Friday and Saturday.
160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be normal on Thursday, Friday and Saturday. 160 and 80 meter long distance propagation in the northern hemisphere is always mildly to moderately degraded by E region blanketing of low angle F2 propagation until sunset or later.
40 meter short path propagation from North America to the Middle East and south Asia after about 2200Z is likely to be normal on Thursday, mostly normal Friday and mildly degraded on Saturday. Short path propagation between North America and east Asia after about 0800Z is likely to be normal on Thursday, mostly normal Friday and mildly degraded on Saturday.
30 meter propagation crossing the auroral ovals and polar regions is likely to be normal on Thursday, mostly normal Friday and mildly degraded on Saturday. 30 meter long distance propagation is always mildly to moderately degraded within several hours of local noon by E-region blanketing of low angle long distance F2 propagation.
20 meter propagation crossing the auroral ovals and polar regions is likely to be normal on Thursday, mostly normal Friday and mildly degraded on Saturday.
17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be normal on Thursday, mostly normal Friday and mildly degraded on Saturday.. Long path propagation from North America to southeast and east Asia is likely to be normal on Thursday, mostly normal Friday and mildly degraded on Saturday..
12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be normal on Thursday, mostly normal Friday and mildly degraded on Saturday. Long path propagation from North America to southeast and east Asia is likely to be normal on Thursday, mostly normal Friday and mildly degraded on Saturday.
6 meter F2 propagation is unlikely until TEP season begins in March. There is a slight chance of enhanced propagation crossing low latitudes from about 2000-0200Z during the initial phase of strong to severe geomagnetic storms then degrading several hours after initial enhancement.
Sustained southward orientation (-Bz) of the north-south component of the interplanetary magnetic field (IMF) plays a crucial but unpredictable role in triggering all geomagnetic storms. Brief minor to moderate geomagnetic
storms may be gradually triggered when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for at least a few hours coincident with the influence of a geoeffective coronal hole high speed stream or CME. More frequent, longer duration, minor to severe geomagnetic storms may be triggered suddenly and unpredictably when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for a period of several hours or more coincident with the influence of a geoeffective CME and solar wind speed of about 500 km/second or more.
Mid-latitude northern hemisphere sunrise is seven minutes earlier and sunset is 39 minutes later than it was on December 21st. Sunrise is about two hours earlier and sunset is about two hours later at the altitude of the refracting F2 region. Sunrise is about one hour earlier, and sunset is about one hour later at the altitude of the daytime absorbing D region.
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The 2200Z Tuesday Penticton 10.7 cm observed solar flux index was 170 .
The early Wednesday SILSO Estimated International Sunspot Number (EISN) was 112.
6 meter F2 propagation is unlikely until TEP season begins in March.
HF propagation crossing polar and auroral regions is likely to be
mostly normal on Wednesday, Thursday and Friday.
HF propagation crossing mid and low latitudes is likely to be
mostly normal on Wednesday, Thursday and Friday.
Long path propagation from North America to south and southeast east Asia
on 80 through 10 meters is likely to be mostly normal on Wednesday, Thursday and Friday.
This forecast derived from today 's NOAA/SWPC web pages and 15 other online sources (the URLs at the end of this forecast) is published five days a week (M-F) in The Daily DX .
All days and times in this forecast are in UTC (Zulu) time.
6 meter F2 propagation is unlikely until TEP season begins in March.
6 meter sporadic-E propagation beyond 2200 km is expected to be very infrequent,
very short duration and very unreliable until March but could occur without warning.
The 2200Z Monday Penticton 10.7 cm observed solar flux index was 170 .
The early Wednesday SILSO Estimated International Sunspot Number was 112.
The visible solar disk has two stable medium active regions and five small active regions. There are 58 sunspots on the visible disk with a total sunspot area of 460 micro-solar hemispheres (about three times the surface area of the Earth).
Solar wind velocity is likely to be less than 400 km/second until at least late Friday
Mostly quiet geomagnetic conditions are likely until at least late Friday.
HF propagation crossing polar and auroral regions is likely to be mostly normal on Wednesday, Thursday and Friday.
No S1-class minor solar energetic particle radiation storms that slightly degrade propagation crossing polar regions are expected through Friday.
There is a chance that M-class solar flares may cause brief periods of minor blackouts of propagation paths crossing the sunlit side of the Earth on Wednesday, Thursday and Friday. There is a slight chance that X-class solar flares may cause about an hour of radio blackouts of propagation paths crossing the sunlit side of the Earth on Wednesday, Thursday and Friday.
160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be mostly normal on Wednesday, Thursday and Friday. 160 and 80 meter long distance propagation in the northern hemisphere is always mildly to moderately degraded by E region blanketing of low angle F2 propagation until sunset or later.
40 meter short path propagation from North America to the Middle East and south Asia after about 2200Z is likely to be mostly normal on Wednesday, Thursday and Friday. Short path propagation between North America and east Asia after about 0800Z is likely to be mostly normal on Wednesday, Thursday and Friday.
30 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Wednesday, Thursday and Friday. 30 meter long distance propagation is always mildly to moderately degraded within several hours of local noon by E-region blanketing of low angle long distance F2 propagation.
20 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Wednesday, Thursday and Friday.
17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Wednesday, Thursday and Friday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal on Wednesday, Thursday and Friday.
12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Wednesday, Thursday and Friday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal on Wednesday, Thursday and Friday.
6 meter F2 propagation is unlikely until TEP season begins in March. There is a slight chance of enhanced propagation crossing low latitudes from about 2000-0200Z during the initial phase of strong to severe geomagnetic storms then degrading several hours after initial enhancement.
Sustained southward orientation (-Bz) of the north-south component of the interplanetary magnetic field (IMF) plays a crucial but unpredictable role in triggering all geomagnetic storms. Brief minor to moderate geomagnetic
storms may be gradually triggered when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for at least a few hours coincident with the influence of a geoeffective coronal hole high speed stream or CME. More frequent, longer duration, minor to severe geomagnetic storms may be triggered suddenly and unpredictably when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for a period of several hours or more coincident with the influence of a geoeffective CME and solar wind speed of about 500 km/second or more.
Mid-latitude northern hemisphere sunrise is six minutes earlier and sunset is 37 minutes later than it was on December 21st. Sunrise is about two hours earlier and sunset is about two hours later at the altitude of the refracting F2 region. Sunrise is about one hour earlier, and sunset is about one hour later at the altitude of the daytime absorbing D region.
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The 2200Z Sunday Penticton 10.7 cm observed solar flux index was 170 .
The early Tuesday SILSO Estimated International Sunspot Number (EISN) was 109.
6 meter F2 propagation is unlikely until TEP season begins in March.
HF propagation crossing polar and auroral regions is likely to be mostly normal on Tuesday, Wednesday and Thursday.
HF propagation crossing low and mid latitudes is likely to be mostly normal on Tuesday, Wednesday and Thursday.
Long path propagation from North America to south and southeast east Asia
on 80 through 10 meters is likely to be mostly normal on Tuesday, Wednesday and Thursday.
This forecast derived from today 's NOAA/SWPC web pages and 15 other online sources (the URLs at the end of this forecast) is published five days a week (M-F) in The Daily DX .
All days and times in this forecast are in UTC (Zulu) time.
6 meter F2 propagation is unlikely until TEP season begins in March.
6 meter sporadic-E propagation beyond 2200 km is expected to be very infrequent, very short duration and very unreliable until March but could occur without warning.
The 2200Z Monday Penticton 10.7 cm observed solar flux index was 162 .
The early Tuesday SILSO Estimated International Sunspot Number was 107.
The visible solar disk has one stable medium active region and five small active regions. There are 56 sunspots on the visible disk with a total sunspot area of 535 micro-solar hemispheres (about three times the surface area of the Earth).
Solar wind velocity is likely to be less than 400 km/second until at least late Thursday
Mostly quiet geomagnetic conditions are likely until at least late Thursday.
HF propagation crossing polar and auroral regions is likely to be mostly normal on Tuesday, Wednesday and Thursday.
No S1-class minor solar energetic particle radiation storms that slightly degrade propagation crossing polar regions are expected through Thursday.
There is a chance that M-class solar flares may cause brief periods of minor blackouts of propagation paths crossing the sunlit side of the Earth on Tuesday, Wednesday and Thursday. There is a slight chance that X-class solar flares may cause about an hour of radio blackouts of propagation paths crossing the sunlit side of the Earth on Tuesday, Wednesday and Thursday.
160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be mostly normal on Tuesday, Wednesday and Thursday. 160 and 80 meter long distance propagation in the northern hemisphere is always mildly to moderately degraded by E region blanketing of low angle F2 propagation until sunset or later.
40 meter short path propagation from North America to the Middle East and south Asia after about 2200Z is likely to be mostly normal on Tuesday, Wednesday and Thursday. Short path propagation between North America and east Asia after about 0800Z is likely to be mostly normal on Tuesday, Wednesday and Thursday.
30 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Tuesday, Wednesday and Thursday. 30 meter long distance propagation is always mildly to moderately degraded within several hours of local noon by E-region blanketing of low angle long distance F2 propagation.
20 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Tuesday, Wednesday and Thursday.
17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Tuesday, Wednesday and Thursday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal on Tuesday, Wednesday and Thursday.
12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Tuesday, Wednesday and Thursday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal on Tuesday, Wednesday and Thursday.
6 meter F2 propagation is unlikely until TEP season begins in March. There is a slight chance of enhanced propagation crossing low latitudes from about 2000-0200Z during the initial phase of strong to severe geomagnetic storms then degrading several hours after initial enhancement.
Sustained southward orientation (-Bz) of the north-south component of the interplanetary magnetic field (IMF) plays a crucial but unpredictable role in triggering all geomagnetic storms. Brief minor to moderate geomagnetic storms may be gradually triggered when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for at least a few hours coincident with the influence of a geoeffective coronal hole high speed stream or CME. More frequent, longer duration, minor to severe geomagnetic storms may be triggered suddenly and unpredictably when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for a period of several hours or more coincident with the influence of a geoeffective CME and solar wind speed of about 500 km/second or more.
Mid-latitude northern hemisphere sunrise is five minutes earlier and sunset is 36 minutes later than it was on December 21st. Sunrise is about two hours earlier and sunset is about two hours later at the altitude of the refracting F2 region. Sunrise is about one hour earlier, and sunset is about one hour later at the altitude of the daytime absorbing D region.
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The 2200Z Sunday Penticton 10.7 cm observed solar flux index was 170 .
The early Monday SILSO Estimated International Sunspot Number (EISN) was 109.
6 meter F2 propagation is likely to be very infrequent, very short duration
and very unreliable until at least early February.
HF propagation crossing polar and auroral regions is likely to be
normal on Monday and mostly normal on Tuesday and Wednesday.
There is a chance of mildly degraded intervals during local nighttime
hours late Wednesday.
HF propagation crossing mid latitudes is likely to be normal on Monday
and mostly normal on Tuesday and Wednesday.
HF propagation crossing low latitudes is likely to be normal on
Monday, Tuesday and Wednesday.
Long path propagation from North America to south and southeast east Asia
on 80 through 10 meters is likely to be normal on Monday and mostly
normal on Tuesday and Wednesday.
This forecast derived from today 's NOAA/SWPC web pages and 15 other online sources (the URLs at the end of this forecast) is published five days a week (M-F) in The Daily DX .
All days and times in this forecast are in UTC (Zulu) time.
Global 6 meter F2 propagation is likely to be very infrequent, very short duration and very unreliable until at least early February . 6 meter sporadic-E propagation beyond 2200 km is expected to be very infrequent, very short duration and very unreliable until March but could occur without warning.
The 2200Z Sunday Penticton 10.7 cm observed solar flux index was 170 .
The early Monday SILSO Estimated International Sunspot Number was 109
The visible solar disk has one stable medium active region and five small active regions. There are 50 sunspots on the visible disk with a total sunspot area of 810 micro-solar hemispheres (about five times the surface area of the Earth).
Solar wind velocity is likely to be less than 400 km/second until at least late Tuesday , increasing to about 400 km/second by late Wednesday due to weak CME effects.
Quiet geomagnetic conditions are likely on Monday and Tuesday. Mostly quiet conditions are likely on Wednesday.
HF propagation crossing polar and auroral regions is likely to be normal on Monday and mostly normal on Tuesday and Wednesday.
There is a slight chance that S1-class minor solar energetic particle radiation storms may slightly degrade propagation crossing polar regions on Monday.
There is a chance that M-class solar flares may cause brief periods of minor blackouts of propagation paths crossing the sunlit side of the Earth on Monday, Tuesday and Wednesday. There is a slight chance that X-class solar flares may cause about an hour of radio blackouts of propagation paths crossing the sunlit side of the Earth on Monday, Tuesday and Wednesday.
160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be normal on Monday, Tuesday and Wednesday. 160 and 80 meter long distance propagation in the northern hemisphere is always mildly to moderately degraded by E region blanketing of low angle F2 propagation until sunset or later.
40 meter short path propagation from North America to the Middle East and south Asia after about 2200Z is likely to be normal on Monday and mostly normal on Tuesday and Wednesday. Short path propagation between North America and east Asia after about 0800Z is likely to be normal on Monday and Tuesday and mostly normal on Wednesday.
30 meter propagation crossing the auroral ovals and polar regions is likely to be normal on be normal on Monday and mostly normal on Tuesday and Wednesday. 30 meter long distance propagation is always mildly to moderately degraded within several hours of local noon by E-region blanketing of low angle long distance F2 propagation.
20 meter propagation crossing the auroral ovals and polar regions is likely to be normal on Monday and mostly normal on Tuesday and Wednesday.
17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be normal on Monday and mostly normal on Tuesday and Wednesday. Long path propagation from North America to southeast and east Asia is likely to be normal on Monday and mostly normal on Tuesday and Wednesday.
12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be normal on Monday and mostly normal on Tuesday and Wednesday. Long path propagation from North America to southeast and east Asia is likely to be normal on Monday and mostly normal on Tuesday and Wednesday.
There is a slight chance of unreliable above-the-MUF 6 meter F2 propagation over Africa from the more easterly US states to the Indian Ocean, equatorial and southern Africa (e.g., 3B8. 3B9, 7Q, D2, FR, V5, ZD7 and ZS) from about 1400-1700Z on Monday, Tuesday and Wednesday. There is a slight chance of unreliable above-the-MUF propagation from the more westerly US states to the South Pacific from about 2100Z to 0200Z Monday, Tuesday and Wednesday. There is a slight chance of enhanced propagation crossing low latitudes from about 2000-0200Z during the initial phase of strong to severe geomagnetic storms then degrading several hours after initial enhancement.
Sustained southward orientation (-Bz) of the north-south component of the interplanetary magnetic field (IMF) plays a crucial but unpredictable role in triggering all geomagnetic storms. Brief minor to moderate geomagnetic
storms may be gradually triggered when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for at least a few hours coincident with the influence of a geoeffective coronal hole high speed stream or CME. More frequent, longer duration, minor to severe geomagnetic storms may be triggered suddenly and unpredictably when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for a period of several hours or more coincident with the influence of a geoeffective CME and solar wind speed of about 500 km/second or more.
Mid-latitude northern hemisphere sunrise is four minutes earlier and sunset is 35 minutes later than it was on December 21st. Sunrise is about two hours earlier and sunset is about two hours later at the altitude of the refracting F2 region. Sunrise is about one hour earlier, and sunset is about one hour later at the altitude of the daytime absorbing D region.
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The 2200Z Thursday Penticton 10.7 cm observed solar flux index was 214.
The early Friday SILSO Estimated International Sunspot Number (EISN) was 175.
6 meter F2 propagation is likely to be very infrequent, very short duration
and very unreliable until at least late January.
HF propagation crossing polar and auroral regions is likely to be normal
until at least midday Friday. There is a chance of mildly degraded periods
from midday Friday through early Saturday. Moderately degraded periods
are likely from early through midday Saturday, then gradually improving
to mildly degraded through late Saturday, then gradually improving
to mostly normal from early through late Sunday.
HF propagation crossing mid latitudes is likely to be normal until at least
midday Friday. There is a chance of mildly degraded periods from midday
Friday through early Saturday. There is a chance of moderately degraded
periods from early through midday Saturday, then gradually improving
to mostly normal from early through late Sunday.
HF propagation crossing low latitudes is likely to be normal until
at least midday Friday, and mostly normal on Saturday and Sunday.
Long path propagation from North America to south and southeast east Asia
on 80 through 10 meters is likely to be normal until at least midday Friday.
There is a chance of moderately degraded periods from early through
midday Saturday, then gradually improving to mostly normal from early
through late Sunday.
This forecast derived from today 's NOAA/SWPC web pages and 15 other online sources (the URLs at the end of this forecast) is published five days a week (M-F) in The Daily DX .
All days and times in this forecast are in UTC (Zulu) time.
Global 6 meter F2 propagation is likely to be very infrequent, very short duration and very unreliable until at least late January . 6 meter sporadic-E propagation beyond 2200 km is expected to be very infrequent, very short duration and very unreliable until March but could occur without warning.
The 2200Z Thursday Penticton 10.7 cm observed solar flux index was 214 .
The early Friday SILSO Estimated International Sunspot Number was 175.
The visible solar disk has two decaying large active regions and six small active regions. There are 79 sunspots on the visible disk with a total sunspot area of 1400 micro-solar hemispheres (about nine times the surface area of the Earth).
Solar wind velocity is likely to be about 400 km/second until at least midday Friday , increasing to well above 400 km/second through late Saturday due to effects of multiple CMEs and gradually improving to about 400 km/second during Sunday as CME effects wane.
Mostly quiet geomagnetic conditions are likely until at least midday Friday . Minor to moderate geomagnetic storm conditions are likely from early through midday Saturday, then becoming unsettled to active through late Saturday. Quiet to unsettled conditions are likely during Sunday.
HF propagation crossing polar and auroral regions is likely to be normal until at least midday Friday. There is a chance of mildly degraded periods from midday Friday through early Saturday. Moderately degraded periods are likely from early through midday Saturday, then gradually improving to mildly degraded through late Saturday. Propagation is likely to gradually improve to mostly normal from early through late Sunday.
There is a slight chance that S1-class minor solar energetic particle radiation storms may slightly degrade propagation crossing polar regions on Friday, Saturday and Sunday.
M-class solar flares are likely to cause brief periods of minor blackouts of propagation paths crossing the sunlit side of the Earth on Friday, Saturday and Sunday. There is a slight chance that X-class solar flares may cause about an hour of radio blackouts of propagation paths crossing the sunlit side of the Earth on Friday, Saturday and Sunday.
160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be normal on Friday, and mostly normal on Saturday and Sunday. 160 and 80 meter long distance propagation in the northern hemisphere is always mildly to moderately degraded by E region blanketing of low angle F2 propagation until sunset or later.
40 meter short path propagation from North America to the Middle East and south Asia after about 2200Z is likely to be mildly degraded on Friday and Saturday improving to mostly normal Sunday. Short path propagation between North America and east Asia after about 0800Z is likely to be normal on Friday. moderately degraded on Saturday and mostly normal on Sunday.
30 meter propagation crossing the auroral ovals and polar regions is likely to be normal until at least midday Friday. There is a chance of mildly degraded periods from midday Friday through early Saturday. Moderately degraded periods are likely from early through midday Saturday, then gradually improving to mildly degraded through late Saturday. Propagation is likely to gradually improve to mostly normal from early through late Sunday. 30 meter long distance propagation is always mildly to moderately degraded within several hours of local noon by E-region blanketing of low angle long distance F2 propagation.
20 meter propagation crossing the auroral ovals and polar regions is likely to be normal until at least midday Friday. There is a chance of mildly degraded periods from midday Friday through early Saturday. Moderately degraded periods are likely from early through midday Saturday, then gradually improving to mildly degraded through late Saturday. Propagation is likely to gradually improve to mostly normal from early through late Sunday.
17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be normal until at least midday Friday. There is a chance of mildly degraded periods from midday Friday through early Saturday. Moderately degraded periods are likely from early through midday Saturday, then gradually improving to mildly degraded through late Saturday. Propagation is likely to gradually improve to mostly normal from early through late Sunday. Long path propagation from North America to southeast and east Asia is likely to be normal until at least midday Friday. There is a chance of moderately degraded periods from early through midday Saturday, then gradually improving to mostly normal from early through late Sunday.
12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to normal until at least midday Friday. There is a chance of mildly degraded periods from midday Friday through early Saturday. Moderately degraded periods are likely from early through midday Saturday, then gradually improving to mildly degraded through late Saturday. Propagation is likely to gradually improve to mostly normal from early through late Sunday. Long path propagation from North America to southeast and east Asia is likely to be normal until at least midday Friday. There is a chance of moderately degraded periods from early through midday Saturday, then gradually improving to mostly normal from early through late Sunday.
There is a slight chance of unreliable above-the-MUF 6 meter F2 propagation over Africa from the more easterly US states to the Indian Ocean, equatorial and southern Africa (e.g., 3B8. 3B9, 7Q, D2, FR, V5, ZD7 and ZS) from about 1400-1700Z on Friday, Saturday and Sunday. There is a slight chance of unreliable above-the-MUF propagation from the more westerly US states to the South Pacific from about 2100Z to 0200Z Friday, Saturday and Sunday. There is a slight chance of enhanced propagation crossing low latitudes from about 2000-0200Z during the initial phase of strong to severe geomagnetic storms then degrading several hours after initial enhancement.
Sustained southward orientation (-Bz) of the north-south component of the interplanetary magnetic field (IMF) plays a crucial but unpredictable role in triggering all geomagnetic storms. Brief minor to moderate geomagnetic
storms may be gradually triggered when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for at least a few hours coincident with the influence of a geoeffective coronal hole high speed stream or CME. More frequent, longer duration, minor to severe geomagnetic storms may be triggered suddenly and unpredictably when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for a period of several hours or more coincident with the influence of a geoeffective CME and solar wind speed of about 500 km/second or more.
Mid-latitude northern hemisphere sunrise is three minutes earlier and sunset is 33 minutes later than it was on December 21st. Sunrise is about two hours earlier and sunset is about two hours later at the altitude of the refracting F2 region. Sunrise is about one hour earlier, and sunset is about one hour later at the altitude of the daytime absorbing D region.
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The 2200Z Tuesday Penticton 10.7 cm observed solar flux index was 234 . The latest SILSO Estimated International Sunspot Number (EISN) was 161.
6 meter F2 propagation is likely to be infrequent, short duration and unreliable until at least late January.
HF propagation crossing polar and auroral regions is likely to be mostly normal from Wednesday through at least midday Friday with a chance of becoming mildly degraded by late Friday.
HF propagation crossing mid latitudes is likely to be normal from Wednesday through at least midday Friday then becoming mostly normal by late Friday.
HF propagation crossing low latitudes is likely to be normal on Wednesday, Thursday and Friday.
Long path propagation from North America to south and southeast east Asia
on 80 through 10 meters is likely to be normal from Thursday through at least midday Friday then becoming mostly normal late Friday.
This forecast derived from today 's NOAA/SWPC web pages and 15 other online sources (the URLs at the end of this forecast) is published five days a week (M-F) in The Daily DX .
All days and times in this forecast are in UTC (Zulu) time.
Global 6 meter F2 propagation is likely to be infrequent, short duration and unreliable until at least late January . 6 meter sporadic-E propagation beyond 2200 km is expected to be very infrequent, very short duration and very unreliable until March but could occur without warning.
The visible solar disk has two decaying large active regions, one growing medium active region, one stable medium active region, one decaying medium active region and three small active regions. There are 98 sunspots on the visible disk with a total sunspot area of 1830 micro-solar hemispheres (about 11 times the surface area of the Earth).
Solar wind velocity is likely to be well above 400 km/second on Wednesday then gradually declining to about 400 km/second or less by early Thursday with a chance of increasing to well above 400 km/second by late Friday due to a possible glancing blow by a CME.
Mostly quiet geomagnetic conditions are likely on Wednesday. Quiet conditions are likely on from early Thursday through at least midday Friday. There is a chance of unsettled to active conditions by late Friday due to a possible glancing blow by a CME. We are in the solstice season when strong geomagnetic disturbances are about half as likely and not as strong or long lasting as during the equinox seasons.
Propagation crossing auroral and polar regions is likely to be mostly normal from Wednesday through at least midday Friday with a chance of becoming mildly degraded by late Friday.
There is a slight chance that S1-class minor solar energetic particle radiation storms may slightly degrade propagation crossing polar regions on Wednesday, Thursday and Friday.
M-class solar flares are likely to cause brief periods of minor blackouts of propagation paths crossing the sunlit side of the Earth on Wednesday, Thursday and Friday. There is a slight chance that X-class solar flares may cause about an hour of radio blackouts of propagation paths crossing the sunlit side of the Earth on Wednesday, Thursday and Friday.
160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be normal on Wednesday, Thursday and Friday. 160 and 80 meter long distance propagation in the northern hemisphere is always mildly to moderately degraded by E region blanketing of low angle F2 propagation until sunset or later.
40 meter short path propagation from North America to the Middle East and south Asia after about 2200Z is likely to be mostly normal on Wednesday and Thursday with a chance of mild degradation on Friday. Short path propagation between North America and east Asia after about 0800Z is likely to be mostly normal on Wednesday, Thursday and Friday.
30 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal from Wednesday through at least midday Friday with a chance of mild degradation by late Friday. 30 meter long distance propagation is always mildly to moderately degraded within several hours of local noon by E-region blanketing of low angle long distance F2 propagation.
20 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal from Wednesday through at least midday Friday with a chance of mild degradation by late Friday.
17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal from Wednesday through at least midday Friday with a chance of mild degradation by late Friday. 17 and 15 meter long path propagation from North America to southeast and east Asia is likely to be normal from Wednesday through at least midday Friday with a chance of mild degradation by late Friday.
12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal from Wednesday through at least midday Friday with a chance of mild degradation by late Friday. 12 and 10 meter long path propagation from North America to southeast and east Asia is likely to be normal from Wednesday through at least midday Friday with a chance of mild degradation by late Friday.
There is a slight chance of unreliable above-the-MUF 6 meter F2 propagation over Africa from the more easterly US states to the Indian Ocean, equatorial and southern Africa (e.g., 3B8. 3B9, 7Q, D2, FR, V5, ZD7 and ZS) from about 1400-1700Z on Wednesday, Thursday and Friday. There is a slight chance of unreliable above-the-MUF propagation from the more westerly US states to the South Pacific from about 2100Z to 0200Z Wednesday, Thursday and Friday. There is a slight chance of enhanced propagation crossing low latitudes from about 2000-0200Z during the initial phase of strong to severe geomagnetic storms then degrading several hours after initial enhancement.
Sustained southward orientation (-Bz) of the north-south component of the interplanetary magnetic field (IMF) plays a crucial but unpredictable role in triggering all geomagnetic storms. Brief minor to moderate geomagnetic
storms may be gradually triggered when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for at least a few hours coincident with the influence of a geoeffective coronal hole high speed stream or CME. More frequent, longer duration, minor to severe geomagnetic storms may be triggered suddenly and unpredictably when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for a period of several hours or more coincident with the influence of a geoeffective CME and solar wind speed of about 500 km/second or more.
Mid-latitude northern hemisphere sunrise is two minutes earlier and sunset is 30 minutes later than it was on December 21st. Sunrise is about two hours earlier and sunset is about two hours later at the altitude of the refracting F2 region. Sunrise is about one hour earlier, and sunset is about one hour later at the altitude of the daytime absorbing D region.
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The 1800Z Monday Penticton 10.7 cm observed solar flux index was 234 .
The early Tuesday SILSO Estimated International Sunspot Number (EISN) was 258.
6 meter F2 propagation is likely to be infrequent, short duration and unreliable
until at least late January.
HF propagation crossing polar and auroral regions is likely to be mildly degraded during Tuesday local nighttime hours improving to mostly normal by Thursday.
HF propagation crossing mid latitudes is likely to be mostly normal on Tuesday and Wednesday improving to normal on Thursday.
HF propagation crossing low latitudes is likely to be normal on Tuesday, Wednesday and Thursday.
Long path propagation from North America to south and southeast east Asia
on 80 through 10 meters is likely to be mostly normal on Tuesday and Wednesday improving to normal on Thursday.
This forecast derived from today 's NOAA/SWPC web pages and 15 other online sources (the URLs at the end of this forecast) is published five days a week (M-F) in The Daily DX .
All days and times in this forecast are in UTC (Zulu) time.
Global 6 meter F2 propagation is likely to be infrequent, short duration and unreliable until at least late January . 6 meter sporadic-E propagation beyond 2200 km is expected to be very infrequent, very short duration and very unreliable until March but could occur without warning.
The 1800Z Monday Penticton 10.7 cm observed solar flux index was 234 .
The early Tuesday SILSO Estimated International Sunspot Number was 258 .
The visible solar disk has two growing large active regions, one decaying large active region, two stable medium active regions and five small active regions. There are 63 sunspots on the visible disk with a total sunspot area of 2030 micro-solar hemispheres (about 12 times the surface area of the Earth).
Solar wind velocity is likely to be well above 400 km/second on Tuesday then gradually declining to about 400 km/second or less by Thursday.
Quiet to unsettled geomagnetic conditions with a chance of minor geomagnetic storm conditions are likely on Tuesday. Mostly quiet conditions are likely on Wednesday. Quiet conditions are likely on Thursday. We are in the solstice season when strong geomagnetic disturbances are about half as likely and not as strong or long lasting as during the equinox seasons.
Propagation crossing auroral and polar regions is likely to be mildly disturbed during Tuesday nighttime hours improving to mostly normal on Wednesday and Thursday .
It is likely that M-class solar flares will cause brief periods of minor blackouts of propagation paths crossing the sunlit side of the Earth on Tuesday, Wednesday and Thursday. There is a very chance that X-class solar flares may cause about an hour of radio blackouts of propagation paths crossing the sunlit side of the Earth on Tuesday, Wednesday and Thursday.
160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be mostly normal on Tuesday and Wednesday improving to normal on Thursday. 160 and 80 meter long distance propagation in the northern hemisphere is always mildly to moderately degraded by E region blanketing of low angle F2 propagation until sunset or later.
40 meter short path propagation from North America to the Middle East and south Asia after about 2200Z is likely to be mostly normal on Tuesday improving to normal on Wednesday and Thursday. Short path propagation between North America and east Asia after about 0800Z is likely to be mostly normal on Tuesday improving to normal on Wednesday and Thursday.
30 meter propagation crossing the auroral ovals and polar regions is likely to be mildly degraded during Tuesday nighttime hours improving to mostly normal on Wednesday and normal on Thursday.
30 meter long distance propagation is always mildly to moderately degraded within several hours of local noon by E-region blanketing of low angle long distance F2 propagation.
20 meter propagation crossing the auroral ovals and polar regions is likely to be mildly degraded during Tuesday nighttime hours improving to mostly normal on Wednesday and normal on Thursday.
17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be mildly degraded during Tuesday nighttime hours improving to mostly normal on Wednesday and normal on Thursday.
17 and 15 meter long path propagation from North America to southeast and east Asia is likely to be mildly degraded during Tuesday nighttime hours improving to mostly normal on Wednesday and normal on Thursday.
12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be mildly degraded during Tuesday nighttime hours improving to mostly normal on Wednesday and normal on Thursday. 12 and 10 meter long path propagation from North America to southeast and east Asia is likely to be mildly degraded during Tuesday nighttime hours improving to mostly normal on Wednesday and normal on Thursday
There is a chance of unreliable above-the-MUF 6 meter F2 propagation over Africa from the more easterly US states to the Indian Ocean, equatorial and southern Africa (e.g., 3B8. 3B9, 7Q, D2, FR, V5, ZD7 and ZS) from about 1400-1700Z on Tuesday, Wednesday and Thursday. There is a chance of unreliable above-the-MUF propagation from the more westerly US states to the South Pacific from about 2100Z to 0200Z Tuesday, Wednesday and Thursday. There is a slight chance of enhanced propagation crossing low latitudes from about 2000-0200Z during the initial phase of strong to severe geomagnetic storms then degrading
Sustained southward orientation (-Bz) of the north-south component of the interplanetary magnetic field (IMF) plays a crucial but unpredictable role in triggering all geomagnetic storms. Brief minor to moderate geomagnetic
storms may be gradually triggered when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for at least a few hours coincident with the influence of a geoeffective coronal hole high speed stream or CME. More frequent, longer duration, minor to severe geomagnetic storms may be triggered suddenly and unpredictably when the IMF is sustained in a southward orientation (-Bz) with IMF field strength of about 5 nanoteslas or more for a period of several hours or more coincident with the influence of a geoeffective CME and solar wind speed of about 500 km/second or more.
Mid-latitude northern hemisphere sunrise is one minute earlier and sunset is 29 minutes later than it was on December 21st. Sunrise is about two hours earlier and sunset is about two hours later at the altitude of the refracting F2 region. Sunrise is about one hour earlier, and sunset is about one hour later at the altitude of the daytime absorbing D region.
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