TZUTC: -0500   
   MSGID: 202.fidonet-ls_arrl@1:2320/33 2724c622   
   PID: Synchronet 3.19c-Win32 master/5ab79049b Jun 14 2022 MSC 1929   
   TID: SBBSecho 3.15-Win32 master/5ab79049b Jun 14 2022 MSC 1929   
   BBSID: TBOLT   
   CHRS: ASCII 1   
   SB PROP @ ARL $ARLP026   
   ARLP026 Propagation de K7RA   
      
   ZCZC AP26   
   QST de W1AW    
   Propagation Forecast Bulletin 26  ARLP026   
   From Tad Cook, K7RA   
   Seattle, WA  July 1, 2022   
   To all radio amateurs   
      
   SB PROP ARL ARLP026   
   ARLP026 Propagation de K7RA   
      
   Solar activity took a dramatic plunge over the recent reporting week   
   (June 23 to 29) but geomagnetic activity stayed exactly the same.   
   Field Day weekend saw rising geomagnetic numbers, with planetary A   
   index at 8, 16 and 23, Friday through Sunday.   
      
   On Sunday the geomagnetic activity was a problem, although not   
   severe, with many stations in Field Day reporting increased   
   absorption.  The planetary K index peaked at 5 (a big number) at the   
   end of the UTC day on Saturday and continued into the early hours of   
   Sunday, which was early Saturday evening here on the West Coast.   
      
   This happened because of a crack in Earth's magnetosphere, detailed   
   here:   
      
   https://bit.ly/3ONZdQ9   
      
   Compared to the previous seven days, average daily sunspot numbers   
   declined from 124.6 to 49.1, while average daily solar flux dropped   
   from 140.5 to 105.3.   
      
   Planetary and middle latitude A-index averages were both the same as   
   the previous week, all numbers around 11.   
      
   The prediction from the USAF 557th Weather Wing is not very   
   optimistic, with solar flux peaking at 140 on July 11 to 16.   
      
   The prediction shows 10.7 cm solar flux at 90 on July 1, 95 on July   
   2, 105 on July 3 to 5, then 110, 120, 130 and 135 on July 7 to 10,   
   140 on July 11 to 16, then 135, 130, 125 and 120 on July 17 to 20,   
   and 115, 110, 105 and 100 on July 21 to 24, 95 on July 25 and 26,   
   100 on July 27 to 29, then 105, 110, 115, 120 and 125 on July 30   
   through August 3, then 130 on August 4 and 5, and back to 140 again   
   on August 7 to 12.   
      
   Predicted planetary A-index is 5 on July 1 to 7, then 8, 8, 12 and 8   
   on July 8 to 11, 5 on July 12 and 13, 12 on July 14 to 16, 10 on   
   July 17, 8 on July 18 to 21, then 12, 15, 15 and 10 on July 22 to   
   25, and 5 on July 26 through August 4, then 8, 12 and 8 on August 5   
   to 7.   
      
   F. K. Janda, OK1HH writes, "Solar activity has declined over the   
   last seven days.  Geomagnetic activity was highest on June 26   
   (G1-class geomagnetic storm broke out around midnight UT on June 25   
   and 26) and was lower on June 28 and 29.  On June 26, a big, bright   
   CME billowed away from the sun's southern hemisphere.  A slow-moving   
   CME that left the sun could pass close to Earth on June 30.  The   
   near miss, if it occurs, could disturb our planet's magnetic field.   
      
   A dark filament of magnetism erupted in the sun's northern   
   hemisphere on June 28, but no CME was observed after the explosion.   
   Shortwave propagation conditions were relatively worse on June 26   
   and 27.  After that, they began to improve, but only very slowly due   
   to the declining solar activity."   
      
   A new space weather report and forecast from Dr. Tamitha Skov,   
   WX6SWW, our Space Weather Woman.   
      
   https://youtu.be/0yAS_FpLTsk   
      
   Tomas Bayer of the Department of Geomagnetism, RWC Prague, at the   
   Budkov Observatory wrote this geomagnetic activity summary:   
      
   "After the last active events on June 24 to 26, which without a   
   storm event did not exceed the active level (local K-index = 4), we   
   expect a geomagnetic activity decrease to quiet to unsettled level   
   during the coming seven days.   
      
   More unsettled geomagnetic activity can be expected about July 3 and   
   4, and also at the end of the currently forecast period on July 7.   
   Then we expect geomagnetic activity at a quiet to unsettled level."   
      
   Here are pictures of the Budkov Observatory:   
      
   https://bit.ly/3ugnUfv   
      
   https://bit.ly/3bH9Pl4   
      
   How big is our nearest star?   
      
   https://bit.ly/3yb6cv6   
      
   Cycle forecasts, wrong or right?   
      
   https://bit.ly/3R3HQfF   
      
   Storm watch, from the popular press:   
      
   https://bit.ly/3bGvXfs   
      
   Reader David Moore, a frequent contributor, sent this:   
      
   https://bit.ly/3Agoo9g   
      
   It hasn't been updated recently, but here is a blog devoted to   
   propagation:   
      
   http://ka5dwipropagation.blogspot.com   
      
   Send your tips, questions or comments to k7ra@arrl.net.   
      
   For more information concerning shortwave radio propagation, see   
   http://www.arrl.org/propagation and the ARRL Technical Information   
   Service at http://arrl.org/propagation-of-rf-signals.  For an   
   explanation of numbers used in this bulletin, see   
   http://arrl.org/the-sun-the-earth-the-ionosphere.   
      
   An archive of past propagation bulletins is at   
   http://arrl.org/w1aw-bulletins-archive-propagation.  More good   
   information and tutorials on propagation are at http://k9la.us/ .   
      
   Instructions for starting or ending email distribution of ARRL   
   bulletins are at http://arrl.org/bulletins.   
      
   Sunspot numbers for June 23 through 29, 2022 were 69, 60, 31, 33,   
   32, 71, and 48, with a mean of 49.1.  10.7 cm flux was 121.4, 115.4,   
   108.1, 102, 98.2, 96.1, and 96.2, with a mean of 105.3.  Estimated   
   planetary A indices were 10, 8, 16, 23, 12, 8, and 6, with a mean of   
   11.9. Middle latitude A index was 12, 8, 14, 15, 15, 11, and 7, with   
   a mean of 11.7.   
   NNNN   
   /EX   
   --- SBBSecho 3.15-Win32   
    * Origin: The Thunderbolt BBS - Little Rock, Arkansas (1:2320/33)   
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