SB PROP @ ARL $ARLP020
ARLP020 Propagation de K7RA

ZCZC AP20
QST de W1AW 
Propagation Forecast Bulletin 20 ARLP020
From Tad Cook, K7RA
Seattle, WA May 14, 2021
To all radio amateurs 

SB PROP ARL ARLP020
ARLP020 Propagation de K7RA

Sunspot activity returned last Friday, and has held steady since.
Average daily sunspot numbers rose from 11.9 to 21.1, and average
daily solar flux was up 2.1 points to 74.3 for the reporting week
ending May 12.

Geomagnetic activity was quiet until Wednesday when the planetary A
index went to 41, as the result of a CME that blasted out of the Sun
on May 9. It was not expected to be very strong, but when it struck
on May 12 it sparked a G3 class geomagnetic storm, the strongest in
the current solar cycle.

The planetary A index rose to 41, far above an average of 3.8 on the
previous six 
		
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