[South Florida DX Association] ARLP005 Propagation de K7RA

[Bill Marx]

ZCZC AP05
> QST de W1AW  
> Propagation Forecast Bulletin 5  ARLP005
> From Tad Cook, K7RA
> Seattle, WA  February 4, 2005
> To all radio amateurs 
> 
> SB PROP ARL ARLP005
> ARLP005 Propagation de K7RA
> 
> Average daily sunspot numbers were down this week by nearly 17
> points (our reporting week runs from Thursday through the following
> Wednesday for the timing of this bulletin). Over the same days the
> average daily solar flux was also down nearly 17 points. The daily
> geomagnetic indices showed much greater stability, with all of the K
> and A indices down when compared with the previous seven days.
> 
> Look for quiet geomagnetic conditions over the next few days, with
> the February 4-6 (Friday through Sunday) planetary A index around 8,
> 5 and 5. The A index is expected to rise again after this weekend
> probably due to the return of sunspot 720, which caused so much
> recent activity. It returns into view on its 27.5 day rotation, and
> the planetary A index prediction for February 7-9 is 15, 25 and 15.
> 
> Sunspot numbers and solar flux should also rise, with solar flux
> values rising above 100 after February 5, staying relatively high
> (for this point in the declining sunspot cycle) at 130 or above
> around February 7 and continuing for about a week.
> 
> 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 January 27 through February 2 were 43, 43, 30,
> 38, 49, 27 and 28 with a mean of 36.9. 10.7 cm flux was 86.9, 84.9,
> 86.4, 85.5, 86.2, 83.7 and 81.8, with a mean of 85.1. Estimated
> planetary A indices were 3, 6, 20, 16, 19, 6 and 8 with a mean of
> 11.1. Estimated mid-latitude A indices were 2, 5, 16, 10, 15, 4 and
> 7, with a mean of 8.4.
> NNNN
> /EX
>