[South Florida DX Association] ARLP039 Propagation de K7RA

[Bill Marx]

> ZCZC AP39
> QST de W1AW  
> Propagation Forecast Bulletin 39  ARLP039
> From Tad Cook, K7RA
> Seattle, WA  September 24, 2004
> To all radio amateurs 
> 
> SB PROP ARL ARLP039
> ARLP039 Propagation de K7RA
> 
> Fall is here--time for better HF conditions. But this week sunspot
> and solar flux values are down. We went from a daily average sunspot
> number of 77.6 for the week of September 9-15, to 52 during the week
> of September 16-22. Average daily solar flux also dropped from 119.1
> to 101.1 over the same two weeks. Solar flux is expected to remain
> around 90 for September 24-28, and then rise to 100 by October 1.
> Geomagnetic activity should remain low over the same period, with
> planetary A indices in the single digits until October 4, when we
> may see a rise in activity due to returning solar wind.
> 
> More mail is coming in regarding 10-meters. At the peak of the
> cycle, 10-meters sees plenty of activity, but now that conditions
> are not as good on a daily basis, the band can be open but nobody
> knows it unless they call CQ and someone answers, or they tune in
> the beacon stations.
> 
> Donald Anderson, WK6Q of Paradise California wrote about a 10-meter
> opening last Friday and Saturday, September 17-18. Paradise is in
> Northern California, north of Oroville and east of Chico. At 2355z
> on Friday, he worked KB3KTR in Pennsylvania with a 5-7. Then a few
> minutes later at 0005z he worked KB4TWJ in Georgia with 5-9 signals,
> and the next day (local time) at 1950-1956z he worked LW1DDC in
> Argentina with S9 signals followed by CE2WJP in Chile running only
> five watts. Throughout the day he worked a number of stations around
> the U.S. and in Latin America, followed by Japan.  It was a great
> opening.
> 
> Listen to those beacons. If you don't hear activity on the band but
> you hear beacons from some direction that sounds interesting, put
> out a CQ. There might be others tuning 10-meters but changing bands
> or turning off the radio if they don't hear anything. Bo Anderson,
> OZ4B who is west of Copenhagen Denmark suggests this for 12 and
> 10-meters. He also knows the bands are open at times when nobody
> seems to be on.
> 
> If you would like to comment or have a tip, email the author at,
> k7ra at arrl.net.
> 
> For more information concerning propagation and an explanation of
> the numbers used in this bulletin see the ARRL Technical Information
> Service propagation page at,
> http://www.arrl.org/tis/info/propagation.html.
> 
> Sunspot numbers for September 16 through 22 were 80, 76, 50, 42, 59,
> 33 and 24 with a mean of 52. 10.7 cm flux was 108.3, 104.5, 102.7,
> 105.2, 100.5, 94.9 and 91.4, with a mean of 101.1. Estimated
> planetary A indices were 17, 20, 16, 5, 13, 9 and 16, with a mean of
> 13.7. Estimated mid-latitude A indices were 14, 15, 16, 4, 8, 6 and
> 12, with a mean of 10.7.
> NNNN
> /EX
>