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    HF propagation crossing the auroral ovals and polar regions is likely to be

    mildly to moderately degraded especially during local nighttime hours

    through midday Wednesday, improving to mildly degraded through

    midday Thursday then becoming mostly normal after midday Thursday.



    HF propagation crossing mid latitudes is likely to be mostly normal

    to mildly degraded on Tuesday, Wednesday and Thursday.



    HF propagation crossing low latitudes is likely to be mostly normal

    on Tuesday, Wednesday and Thursday.



    The 2300Z Sunday Penticton 10.7 cm observed solar flux index was 159.


    There is a chance of 6 meter TEP propagation from the southern tier of

    U.S. states to South America. There is a slight chance of oblique TEP

    propagation to the South Pacific through late April. There is a chance

    that unreliable geographically focused sporadic-E propagation may

    briefly couple some lucky mid-latitude stations into TEP propagation

    through late-April.



    40 through 10 meter long path propagation from North America to south

    and southeast east Asia is likely to be mildly degraded during local

    nighttime hours through late 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.



    The visible solar disk has one decaying large active region, one decaying medium active region, and four small active regions. There are 57 sunspots on the visible disk with a total sunspot area of 800 micro-solar hemispheres (approximately five times the surface area of the Earth).

    Solar wind velocity is likely to remain at about 600 km/second through midday Thursday, then steadily declining to about 450 km/second or less from midday through late Thursday.



    Brief periods of minor geomagnetic storm conditions are likely from early Tuesday through early Wednesday; otherwise, unsettled to active geomagnetic conditions are likely from early Tuesday through midday Thursday.




    There is a chance that M-class solar flares may cause periods of minor blackouts of HF propagation paths crossing the sunlit side of the Earth during 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 during Tuesday, Wednesday and Thursday. 1 60 and 80 meter long distance propagation in the northern hemisphere is always moderately degraded by E region blanketing of low angle F2 propagation until after sunset.



    40 meter short path propagation from North America to the Middle East and south Asia after about 2330Z is likely to be mildly degraded on Tuesday then mostly normal on Wednesday and normal on Thursday. Short path propagation between North America and east Asia after about 0900Z is likely to be mildly to moderately degraded on Tuesday and mildly degraded on Wednesday and Thursday.


    30 meter propagation crossing the auroral ovals and polar regions is likely to be

    mildly to moderately degraded during local nighttime hours through early Wednesday, then becoming mildly degraded during local nighttime hours through midday Thursday. Mostly normal propagation is likely after midday 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 to moderately degraded during local nighttime hours through early Wednesday, then becoming mildly degraded during local nighttime hours through midday Thursday. Mostly normal propagation is likely after midday Thursday.



    17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be mildly to moderately degraded during local nighttime hours through early Wednesday, then becoming mildly degraded during local nighttime hours through midday Thursday. Mostly normal propagation is likely after midday Thursday. Long path propagation from North America to southeast and east Asia is likely to be mildly to moderately degraded during local nighttime hours through early Wednesday, then becoming mildly degraded during local nighttime hours through midday Thursday. Mostly normal propagation is likely after midday Thursday.



    12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to mildly to moderately degraded during local nighttime hours through early Wednesday, then becoming mildly degraded during local nighttime hours through midday Thursday. Mostly normal propagation is likely after midday Thursday. Long path propagation from North America to southeast and east Asia is likely to be mildly to moderately degraded during local nighttime hours through early Wednesday, then becoming mildly degraded during local nighttime hours through midday Thursday. Mostly normal propagation is likely after midday Thursday.



    There is a slight chance of enhanced 6 meter 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 50 minutes earlier and sunset is 33 minutes later than it was on March 20th.



    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.
    73 Al 4L5A

    Comment

    •  

      HF propagation crossing the auroral ovals and polar regions is likely to be




      mostly normal with mildly degraded intervals during local nighttime hours

      on Wednesday, Thursday and Friday.



      HF propagation crossing mid and low latitudes is likely to be mostly normal

      on Wednesday, Thursday and Friday.



      The 2300Z Sunday Penticton 10.7 cm observed solar flux index was 162.


      The late Monday SILSO Estimated International Sunspot Number (EISN) was 174.

      There is a chance of 6 meter TEP propagation from the southern tier of

      U.S. states to South America. There is a slight chance of oblique TEP

      propagation to the South Pacific through late April. There is a chance

      that unreliable geographically focused sporadic-E propagation may

      briefly couple some lucky mid-latitude stations into TEP and oblique-TEP

      propagation through late-April.



      40 through 10 meter long path propagation from North America to south

      and southeast east Asia is likely to be mostly normal with mildly degraded

      intervals during local nighttime hours 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.



      The visible solar disk has two decaying medium active regions, and seven small active regions. There are 52 sunspots on the visible disk with a total sunspot area of 610 micro-solar hemispheres (approximately four times the surface area of the Earth).


      Solar wind velocity is likely to remain at about 600 km/second through at least early Friday,



      Mostly unsettled to active geomagnetic conditions are likely on Wednesday, Thursday and Friday.




      There is a chance that M-class solar flares may cause periods of minor blackouts of HF propagation paths crossing the sunlit side of the Earth during 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 during Wednesday, Thursday and Friday. 1 60 and 80 meter long distance propagation in the northern hemisphere is always moderately degraded by E region blanketing of low angle F2 propagation until after sunset.



      40 meter short path propagation from North America to the Middle East and south Asia after about 2330Z is likely to be mildly degraded on Wednesday, Thursday and Friday. Short path propagation between North America and east Asia after about 0900Z is likely to be mildly degraded on Wednesday, Thursday and Friday.


      30 meter propagation crossing the auroral ovals and polar regions is likely to be




      mostly normal with mildly degraded intervals during local nighttime hours 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 with mildly degraded intervals during local nighttime hours on

      Wednesday, Thursday and Friday.




      17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be




      mostly normal with mildly degraded i ntervals during local nighttime hours on

      Wednesday, Thursday and Friday.

      Long path propagation from North America to southeast and east Asia is likely to be




      mostly normal with mildly degraded intervals during local nighttime hours on

      Wednesday, Thursday and Friday.






      12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be

      mostly normal with mildly degraded intervals during local nighttime hours on Wednesday, Thursday and Friday.

      Long path propagation from North America to southeast and east Asia is likely to be mildly degraded during local nighttime hours on Wednesday, Thursday and Friday.



      There is a very slight chance of enhanced 6 meter 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 52 minutes earlier and sunset is 34 minutes later than it was on March 20th.



      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.


      73 Al 4L5A

      Comment

      •  

        HF propagation crossing the auroral ovals and polar regions is likely to be
        mostly normal on Thursday, Friday and Saturday.

        HF propagation crossing mid latitudes is likely to be mostly normal
        on Thursday, Friday and Saturday.

        HF propagation crossing low latitudes is likely to be normal
        on Thursday, Friday and Saturday.

        The 2300Z Sunday Penticton 10.7 cm observed solar flux index was 169.

        There is a chance of 6 meter TEP propagation from the southern tier of U.S. states to South America. There is a slight chance of oblique TEP propagation to the South Pacific through late April. There is a chance that unreliable geographically focused sporadic-E propagation may briefly couple some lucky mid-latitude stations into TEP and oblique-TEP propagation through late-April.

        40 through 10 meter long path propagation from North America to south and southeast east Asia is likely to be mostly 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.

        The visible solar disk has two stable medium active regions and six small active regions. There are 52 sunspots on the visible disk with a total sunspot area of 700 micro-solar hemispheres (approximately four times the surface area of the Earth).


        Solar wind velocity is likely to remain at about 500 km/second through early Saturday when it is likely to decline to about 400 km/second.

        Quiet to unsettled geomagnetic conditions are likely on Thursday, Friday and Saturday.

        There is a chance that M-class solar flares may cause periods of minor blackouts of HF propagation paths crossing the sunlit side of the Earth during Thursday, Friday and Saturday.

        160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be mostly normal during Thursday, Friday and Saturday. 160 and 80 meter long distance propagation in the northern hemisphere is always moderately degraded by E region blanketing of low angle F2 propagation until after sunset.

        40 meter short path propagation from North America to the Middle East and south Asia after about 2350Z is likely to be mostly normal on Thursday, Friday and Saturday. Short path propagation between North America and east Asia after about 0930Z is likely to be mildly degraded on Thursday and normal on Friday and Saturday.

        30 meter propagation crossing the auroral ovals and polar regions is likely to be
        mostly normal on Thursday, Friday and 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
        mostly normal on Thursday, Friday and Saturday.

        17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Thursday, Friday and Saturday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal on Thursday, Friday and Saturday.

        12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Thursday, Friday and Saturday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal on Thursday, Friday and Saturday.

        There is a very slight chance of enhanced 6 meter 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 53 minutes earlier and sunset is 35 minutes later than it was on March 20th.

        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.


        73 Al 4L5A

        Comment

        •  

          HF propagation crossing the auroral ovals and polar regions is likely
          to be mostly normal with a chance of brief degraded intervals on
          Friday, Saturday and Sunday.

          HF propagation crossing mid latitudes is likely to be normal with a
          chance of brief degraded intervals on Friday, Saturday and Sunday.

          HF propagation crossing low latitudes is likely to be
          normal on Friday, Saturday and Sunday.

          The 2300Z Thursday Penticton 10.7 cm observed solar flux index was 169.

          The late Thursday SILSO Estimated International Sunspot Number (EISN) was 203.

          There is a chance of 6 meter TEP propagation from the southern tier of
          U.S. states to South America. There is a slight chance of oblique TEP
          propagation to the South Pacific through late April. There is a chance that
          unreliable geographically focused sporadic-E propagation may briefly
          couple some lucky mid-latitude stations into TEP and oblique-TEP
          propagation through late-April.

          40 through 10 meter long path propagation from North America to south
          and southeast east Asia is likely to be mostly normal on Friday, Saturday
          and 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.

          The visible solar disk has one stable medium active region and ten small active regions. There are 42 sunspots on the visible disk with a total sunspot area of 600 micro-solar hemispheres (approximately four times the surface area of the Earth).

          Solar wind velocity is likely to remain at about 500 km/second or less through Sunday.

          Quiet to unsettled geomagnetic conditions are likely on Friday, mostly quiet on Saturday and quiet to unsettled with brief active intervals on Sunday.

          There is a chance that M-class solar flares may cause periods of minor blackouts of HF propagation paths crossing the sunlit side of the Earth during Friday, Saturday and Sunday.

          160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be mostly normal during Friday, Saturday and Sunday. 160 and 80 meter long distance propagation in the northern hemisphere is always moderately degraded by E region blanketing of low angle F2 propagation until after sunset.

          40 meter short path propagation from North America to the Middle East and south Asia after about 2350Z is likely to be normal on Friday and Saturday and mostly normal on Sunday. Short path propagation between North America and east Asia after about 0930Z is likely to be mostly normal on Friday, normal on Saturday and mostly normal on Sunday.

          30 meter propagation crossing the auroral ovals and polar regions is likely to be
          mostly normal on Friday, Saturday and 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 mostly normal on Friday, Saturday and Sunday.

          17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Friday, Saturday and Sunday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal on Friday, Saturday and Sunday.

          12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal on Friday, Saturday and Sunday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal on Friday, Saturday and Sunday.

          There is a very slight chance of enhanced 6 meter 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 55 minutes earlier and sunset is 37 minutes later than it was on March 20th.

          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.

          73 Al 4L5A

          Comment

          •  

            HF propagation crossing the auroral ovals and polar regions is likely
            to be normal with a chance of isolated nighttime minor degradations
            on Monday, Tuesday and Wednesday.

            HF propagation crossing mid and low latitudes is likely to be normal
            on Monday, Tuesday and Wednesday.

            The 2300Z Sunday Penticton 10.7 cm observed solar flux index was 154.

            There is a chance of 6 meter TEP propagation from the southern tier of
            U.S. states to South America. There is a slight chance of oblique TEP
            propagation to the South Pacific through late April. There is a chance that
            unreliable geographically focused sporadic-E propagation may briefly
            couple some lucky mid-latitude stations into TEP and oblique-TEP
            propagation through late-April.

            40 through 10 meter long path propagation from North America to
            south and southeast east Asia is likely to be normal on Monday,
            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.

            The visible solar disk has one stable medium active region, one decaying medium active region and seven small active regions. There are 29 sunspots on the visible disk with a total sunspot area of 420 micro-solar hemispheres (approximately three times the surface area of the Earth).
            www.solarham.com/regions.htm

            Solar wind velocity is likely to remain at about 400 km/second or less through Wednesday.

            Quiet to unsettled geomagnetic conditions are likely on Monday, mostly quiet on Tuesday and quiet on Wednesday.

            There is a chance that M-class solar flares may cause brief periods of minor blackouts of HF propagation paths crossing the sunlit side of the Earth during Monday, Tuesday and Wednesday.

            160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be mostly normal during Monday and Tuesday and normal on Wednesday. 160 and 80 meter long distance propagation in the northern hemisphere is always moderately degraded by E region blanketing of low angle F2 propagation until after sunset.

            40 meter short path propagation from North America to the Middle East and south Asia after about 2350Z is likely to be mostly normal during Monday and Tuesday and normal on Wednesday. Short path propagation between North America and east Asia after about 0930Z is likely to be mostly normal on Monday, normal on Tuesday and mostly normal on Wednesday.

            30 meter propagation crossing the auroral ovals and polar regions is likely to be
            mostly normal during Monday and Tuesday and normal on 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
            mostly normal during Monday and Tuesday and normal on Wednesday.

            17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal during Monday and Tuesday and normal on Wednesday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal during Monday and Tuesday and normal on Wednesday.

            12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal during Monday and Tuesday and normal on Wednesday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal during Monday and Tuesday and normal on Wednesday.

            There is a very slight chance of enhanced 6 meter 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 57 minutes earlier and sunset is 39 minutes later than it was on March 20th.

            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.

            73 Al 4L5A

            Comment

            •  

              HF propagation crossing the auroral ovals and polar regions is likely to be
              mostly normal with a chance of isolated nighttime minor degradations on
              Tuesday, Wednesday and Thursday.

              HF propagation crossing mid latitudes is likely to be normal on
              Tuesday and Wednesday and mostly normal on Thursday.

              HF propagation crossing low latitudes is likely to be normal on
              Tuesday, Wednesday and Thursday.

              The 2300Z Monday Penticton 10.7 cm observed solar flux index was 153.

              The early Tuesday SILSO Estimated International Sunspot Number (EISN) was 107.

              There is a chance of 6 meter TEP propagation from the southern tier of
              U.S. states to South America. There is a slight chance of oblique TEP
              propagation to the South Pacific through late April. There is a chance that
              unreliable geographically focused sporadic-E propagation may briefly
              couple some lucky mid-latitude stations into TEP and oblique-TEP
              propagation through late-April.

              40 through 10 meter long path propagation from North America to
              south and southeast east Asia 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.

              The visible solar disk has one stable medium active region and eight small active regions. There are 28 sunspots on the visible disk with a total sunspot area of 410 micro-solar hemispheres (approximately three times the surface area of the Earth).

              Solar wind velocity is likely to remain at 400 km/second or less through Thursday.

              Mostly quiet to geomagnetic conditions are likely on Tuesday, Wednesday and Thursday.

              There is a slight chance that M-class solar flares may cause brief periods of minor blackouts of HF propagation paths crossing the sunlit side of the Earth during 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 during Tuesday, Wednesday and Thursday. 160 and 80 meter long distance propagation in the northern hemisphere is always moderately degraded by E region blanketing of low angle F2 propagation until after sunset.

              40 meter short path propagation from North America to the Middle East and south Asia after about 2350Z is likely to be mostly normal during Tuesday, Wednesday and Thursday. Short path propagation between North America and east Asia after about 0930Z 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 during 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 during Tuesday, Wednesday and Thursday.

              17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal during Tuesday, Wednesday and Thursday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal during Tuesday, Wednesday and Thursday.

              12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal during Tuesday, Wednesday and Thursday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal during Tuesday, Wednesday and Thursday.

              There is a very slight chance of enhanced 6 meter 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 59 minutes earlier and sunset is 39 minutes later than it was on March 20th.

              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.

              73 Al 4L5A

              Comment

              •  

                HF propagation crossing the auroral ovals and polar regions is likely to be
                mostly normal with a chance of isolated nighttime mild degradations
                on Thursday, Friday and Saturday.

                HF propagation crossing mid latitudes is likely to be mostly normal
                on Thursday, Friday and Saturday

                HF propagation crossing low latitudes is likely to be normal
                on Thursday, Friday and Saturday

                The 2300Z Wednesday Penticton 10.7 cm observed solar flux index was 147.

                The early Thursday SILSO Estimated International Sunspot Number (EISN) was 60.

                There is a chance of 6 meter TEP propagation from the southern tier of
                U.S. states to South America. There is a slight chance of oblique TEP
                propagation to the South Pacific through mid May. There is a chance that
                unreliable geographically focused sporadic-E propagation may briefly
                couple some lucky mid-latitude stations into TEP and oblique-TEP
                propagation through late-April.

                40 through 10 meter long path propagation from North America
                to south and southeast east Asia is likely to be mostly 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.

                The visible solar disk has one growing very large active region and four small active regions. There are 27 sunspots on the visible disk with a total sunspot area of 1190 micro-solar hemispheres (approximately seven times the surface area of the Earth).

                Solar wind velocity is likely to remain at about 450 km/second through Friday, possibly increasing to about 500 km/second on Saturday.

                Quiet to unsettled geomagnetic conditions are likely on from Thursday through late Saturday. Unsettled to active conditions are likely late Saturday with a change of a minor geomagnetic storm.

                There is a slight chance that M-class solar flares may cause brief periods of minor blackouts of HF propagation paths crossing the sunlit side of the Earth during Thursday, Friday and Saturday.

                160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be mostly normal during Thursday, Friday and Saturday. 160 and 80 meter long distance propagation in the northern hemisphere is always moderately degraded by E region blanketing of low angle F2 propagation until after sunset.

                40 meter short path propagation from North America to the Middle East and south Asia after about 2350Z is likely to be mostly normal during Thursday, Friday and Saturday. Short path propagation between North America and east Asia after about 0930Z 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
                mostly normal during Thursday Friday 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 during Thursday, Friday and Saturday.

                17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal during Thursday, Friday and Saturday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal during Thursday, Friday and Saturday.

                12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal during Thursday, Friday and Saturday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal during Thursday, Friday and Saturday.

                There is a very slight chance of enhanced 6 meter 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 61 minutes earlier and sunset is 41 minutes later than it was on March 20th.

                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.

                73 Al 4L5A

                Comment

                •  

                  HF propagation crossing the auroral ovals and polar regions is likely
                  to be mostly normal with a chance of mild nighttime degradations
                  during Monday, Tuesday and Wednesday.

                  HF propagation crossing mid latitudes is likely to be normal on Monday,
                  mostly normal on Tuesday and normal on Wednesday.

                  HF propagation crossing low latitudes is likely to be normal on Monday,
                  Tuesday and Wednesday.

                  The 2300Z Sunday Penticton 10.7 cm observed solar flux index was 157.

                  The early Monday SILSO Estimated International Sunspot Number (EISN) was 94.

                  There is a chance of 6 meter TEP propagation from the southern tier of
                  U.S. states to South America. There is a slight chance of oblique TEP
                  propagation to the South Pacific through mid-May. There is a chance
                  that unreliable geographically focused sporadic-E propagation may
                  briefly couple some lucky mid-latitude stations into TEP and oblique-
                  TEP propagation through mid-May.

                  40 through 10 meter long path propagation from North America to
                  south and southeast east Asia is likely to be mostly normal during
                  Monday, 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.

                  The visible solar disk has one stable very large active region and three small active regions. There are 37 sunspots on the visible disk with a total sunspot area of 1300 micro-solar hemispheres (approximately eight times the surface area of the Earth).

                  Solar wind velocity is likely to remain above 500 km/second through midday Tuesday, then gradually decreasing to about 400 km/second by midday Wednesday.

                  Unsettled to active geomagnetic conditions are likely from Monday through early Tuesday. Mostly quiet to unsettled conditions are likely from early Tuesday through early Wednesday then improving to mostly quiet through late Wednesday.

                  There is a chance that M-class solar flares may cause brief periods of minor blackouts of HF propagation paths crossing the sunlit side of the Earth during Monday, Tuesday and Wednesday.

                  160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be mostly normal with a chance of mild nighttime degradations during Monday, Tuesday and Wednesday. 160 and 80 meter long distance propagation in the northern hemisphere is always moderately degraded by E region blanketing of low angle F2 propagation until after sunset.

                  40 meter short path propagation from North America to the Middle East and south Asia after about 2350Z is likely to be mildly degraded on Monday, mostly normal on Tuesday and normal on Wednesday. Short path propagation between North America and east Asia after about 0930Z is likely to be mildly degraded on Monday, mostly normal on Tuesday and normal on Wednesday.

                  30 meter propagation crossing the auroral ovals and polar regions is likely to be
                  mostly normal with a chance of mild nighttime degradations during Monday, 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
                  mostly normal with a chance of mild nighttime degradations during Monday, Tuesday and Wednesday.

                  17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal with a chance of mild nighttime degradations during Monday, Tuesday and Wednesday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal during Monday, Tuesday and Wednesday.

                  12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal with a chance of mild nighttime degradations during Monday, Tuesday and Wednesday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal during Monday, Tuesday and Wednesday.

                  There is a very slight chance of enhanced 6 meter 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 65 minutes earlier and sunset is 43 minutes later than it was on March 20th.

                  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.
                  73 Al 4L5A

                  Comment

                  •  

                    HF propagation crossing the auroral ovals and polar regions is likely
                    to be mostly normal with a chance of mild nighttime degradations
                    during Tuesday, Wednesday and Thursday.

                    HF propagation crossing mid latitudes is likely to be mostly normal
                    during Tuesday and Wednesday and normal on Thursday.

                    HF propagation crossing low latitudes is likely to be normal
                    during Tuesday, Wednesday and Thursday.

                    The 2300Z Monday Penticton 10.7 cm observed solar flux index was 159.


                    The late Monday SILSO Estimated International Sunspot Number (EISN) was 103.

                    There is a chance of 6 meter TEP propagation from the southern tier of
                    U.S. states to South America. There is a slight chance of oblique TEP
                    propagation to the South Pacific through mid-May. There is a chance
                    that unreliable geographically focused sporadic-E propagation may
                    briefly couple some lucky mid-latitude stations into TEP and oblique
                    TEP propagation through mid-May.

                    40 through 10 meter long path propagation from North America
                    to south and southeast east Asia is likely to be mostly normal
                    during Tuesday and Wednesday and 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.

                    The visible solar disk has one stable very large active region and four small active regions. There are 58 sunspots on the visible disk with a total sunspot area of 1420 micro-solar hemispheres (approximately eight times the surface area of the Earth).


                    Solar wind velocity is likely to remain above 500 km/second through Wednesday, then gradually decreasing to about 400 km/second by Thursday.

                    Unsettled to active geomagnetic conditions are likely from Tuesday through early Wednesday. Mostly quiet to unsettled conditions are likely from early Wednesday through early Thursday then improving to mostly quiet through late Thursday.

                    There is a chance that M-class solar flares may cause brief periods of minor blackouts of HF propagation paths crossing the sunlit side of the Earth during 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 with a chance of mild nighttime degradations during Tuesday, Wednesday and Thursday. 160 and 80 meter long distance propagation in the northern hemisphere is always moderately degraded by E region blanketing of low angle F2 propagation until after sunset.

                    40 meter short path propagation from North America to the Middle East and south Asia after about 2350Z is likely to be mildly degraded on Tuesday and mostly normal on Wednesday and Thursday. Short path propagation between North America and east Asia after about 0930Z is likely to be mildly degraded on Tuesday and mostly normal on Wednesday and Thursday.

                    30 meter propagation crossing the auroral ovals and polar regions is likely to be
                    mostly normal with a chance of mild nighttime degradations during 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 with a chance of mild nighttime degradations during Tuesday, Wednesday and Thursday.

                    17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal with a chance of mild nighttime degradations during Tuesday, Wednesday and Thursday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal during Tuesday, Wednesday and Thursday.

                    12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal with a chance of mild nighttime degradations during Tuesday, Wednesday and Thursday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal during Tuesday, Wednesday and Thursday.

                    There is a very slight chance of enhanced 6 meter 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 68 minutes earlier and sunset is 46 minutes later than it was on March 20th.

                    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.


                    73 Al 4L5A

                    Comment

                    •  

                      HF propagation crossing the auroral ovals and polar regions is likely to be mostly normal with a chance of mild nighttime degradations on either
                      or both ends of propagation paths during Thursday, Friday and Saturday.

                      HF propagation crossing mid latitudes is likely to be normal during Thursday, mostly normal during Friday and normal during Saturday.

                      HF propagation crossing low latitudes is likely to be normal during Thursday, Friday and Saturday.

                      The 2300Z Wednesday Penticton 10.7 cm observed solar flux index was 154.

                      The early Thursday SILSO Estimated International Sunspot Number (EISN) was 107.

                      There is a chance of 6 meter TEP propagation from the southern tier of U.S. states to South America. There is a slight chance of oblique TEP
                      propagation to the South Pacific and Sub-Saharan Africa through mid-May.
                      There is a chance that unreliable geographically focused sporadic-E propagation may briefly couple some lucky mid-latitude stations into
                      TEP and oblique-TEP propagation through mid-May.

                      40 through 10 meter long path propagation from North America to south and southeast east Asia is likely to be normal during Thursday,
                      mostly normal during Friday and normal during 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.

                      The visible solar disk has one decaying very large active region, one stable medium region and one decaying medium region. There are 54 sunspots on the visible disk with a total sunspot area of 1480 micro-solar hemispheres (approximately nine times the surface area of the Earth).


                      Solar wind velocity is likely to remain mostly below 500 km/second on Thursday increasing to above 500 km/second on Friday and declining to below 500 km/second during Saturday.

                      Quiet to unsettled geomagnetic conditions are likely during Thursday. Mostly active conditions are likely during Friday with likely brief minor geomagnetic storm conditions late Friday. Active conditions are likely early Saturday improving to quiet to unsettled through late Saturday

                      There is a chance that M-class solar flares may cause brief periods of minor blackouts of HF propagation paths crossing the sunlit side of the Earth during Thursday, Friday and Saturday.

                      160 and 80 meter propagation from North America to VK/ZL and the South Pacific is likely to be mostly normal with a chance of mild nighttime degradations during Thursday, Friday and Saturday. 160 and 80 meter long distance propagation in the northern hemisphere is always moderately degraded by E region blanketing of low angle F2 propagation until after sunset.

                      40 meter short path propagation from North America to the Middle East and south Asia after about 2350Z is likely to be mostly normal on Thursday, mildly degraded on Friday and mostly normal on Saturday. Short path propagation between North America and east Asia after about 0930Z is likely to be normal on Thursday, mildly degraded on Friday and mostly normal on Saturday.

                      30 meter propagation crossing the auroral ovals and polar regions is likely to be
                      mostly normal with a chance of mild nighttime degradations on either or both ends of propagation paths during Thursday, Friday and 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
                      mostly normal with a chance of mild nighttime degradations on either or both ends of propagation paths during Thursday, Friday and Saturday,

                      17 and 15 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal with a chance of mild nighttime degradations on either or both ends of propagation paths during Thursday, Friday and Saturday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal during Thursday, Friday and Saturday,

                      12 and 10 meter propagation crossing the auroral ovals and polar regions is likely to be mostly normal with a chance of mild nighttime degradations on either or both ends of propagation paths during Thursday, Friday and Saturday. Long path propagation from North America to southeast and east Asia is likely to be mostly normal during Thursday, Friday and Saturday.

                      There is a very slight chance of enhanced 6 meter 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 70 minutes earlier and sunset is 48 minutes later than it was on March 20th.

                      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.

                      73 Al 4L5A

                      Comment

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