SB PROP @ ARL $ARLP039
ARLP039 Propagation de K7RA

ZCZC AP39
QST de W1AW 
Propagation Forecast Bulletin 39 ARLP039
From Tad Cook, K7RA
Seattle, WA September 24, 2021
To all radio amateurs 

SB PROP ARL ARLP039
ARLP039 Propagation de K7RA

Last week's Propagation Forecast Bulletin ARLP038 reported a big
increase in activity with the daily sunspot number going to 124, but
by the end of that week all sunspots disappeared. The Sun was blank
for several days, but sunspots returned on September 19.

Average daily sunspot numbers were 28.7 this week, below the 58.3
average reported a week earlier.

Average daily solar flux was down nine points from 87.4 to 78.4.

Geomagnetic indicators were higher, with the highest activity on
September 17 when planetary A index was 24 due to a minor
geomagnetic storm triggered by a wea
		
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