[SFDXA] ARLP034 Propagation de K7RA

[WILLIAM MARX]


> SB PROP @ ARL $ARLP034
> ARLP034 Propagation de K7RA
> 
> ZCZC AP34
> QST de W1AW  
> Propagation Forecast Bulletin 34  ARLP034
> From Tad Cook, K7RA
> Seattle, WA  August 20, 2021
> To all radio amateurs 
> 
> SB PROP ARL ARLP034
> ARLP034 Propagation de K7RA
> 
> Weak solar activity persists, but with just one spotless day in the
> current reporting week, August 12 to 18, on Friday, August 13.  Last
> week we reported four days with no sunspots in the previous seven
> days.
> 
> Average daily sunspot number increased from 9.9 last week to 17.7
> during this week.
> 
> Solar flux was the same, with the average inching from 73.7 to 73.8.
> 
> Geomagnetic indicators were also stable.  Average planetary A index
> was 6.1, compared to 6.3 last week.  Average middle latitude A index
> moved from 7.6 to 7.
> 
> Predicted solar flux is 75 on August 20, 73 on August 21 to 23, 72
> on August 24 to 26, 73 on August 27 to 29, 74 on August 30 through
> September 1, 73 on September 2 to 11, 74 on September 12, 73 on
> September 13 to 17, 72 on September 18, and 73 on September 19 to
> 25.
> 
> Predicted planetary A index is 5 on August 20, then 8, 8, 10, 14, 12
> and 8 on August 21 to 26, 5 on August 27 through September 1, then 8
> and 12 on September 2 and 3, 5 on September 4 to 10, 8 on September
> 11 to 13, 5 on September 14 to 18, then 8, 12 and 8 on September 19
> to 21, and 5 on September 22 to 28.
> 
> On August 14 Spaceweather.com reported that there were no sunspots,
> and that so far in 2021 there were 56 days with no spots.  "That
> might sound like a lot, but it is in fact a sharp reduction from
> hundreds of spotless days observed in 2019 and 2020.  Despite
> today's blank sun, solar activity is intensifying compared to
> previous years."
> 
> Geomagnetic activity forecast for the period August 20 til September
> 14, 2021 from OK1HH, who has returned from his hike in the mountains
> of the Czech Republic:
> 
> "Geomagnetic field will be
> Quiet August 20 and 21, 28, September 1, 5, 10, 14
> Quiet to unsettled August 22, 25 to 27, 31, September 2, 4, 6 to 9
> Quiet to active August 30, September 3, (11 to 13)
> Unsettled to active August (23 and 24, 29)
> Active to disturbed, Nothing predicted
> 
> Remarks:
> - Parenthesis means lower probability of activity enhancement.
> - The predictability of changes is very low because there are not
> enough indications."
> 
> Ken Brown, N4SO reported hearing a new 10 meter beacon, N5TIT/B on
> 28.209 MHz.
> 
> Signal was weak, and the path was 520 miles.
> 
> I've noted that the relatively low solar activity has depressed 10
> meter signals, and my practice of using remote SDR receivers to hunt
> for beacons turns up little activity lately.
> 
> At the end of July I spent 8 days in hospital for neurosurgery, and
> managed to use kiwisdr.com/public/ to hunt for 10 meter beacons, and
> wrote ARLP031 that week as well.  I used the list at
> https://www.qsl.net/wj5o/bcn.htm to help identify them, and sent
> reports to the beacon owners.
> 
> The latest from WX6SWW:
> 
> https://youtu.be/GdI-itUhKec
> 
> 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 August 12 through 18, 2021 were 11, 0, 47, 23,
> 14, 13, and 16, with a mean of 17.7.  10.7 cm flux was 73.6, 72.9,
> 72.6, 74.6, 74.4, 73.1, and 75.3, with a mean of 73.8.  Estimated
> planetary A indices were 4, 6, 5, 10, 7, 5, and 6, with a mean of
> 6.1 Middle latitude A index was 6, 9, 4, 13, 8, 7, and 6, with a
> mean of 7.6.
> NNNN
> /EX