SB PROP @ ARL $ARLP013
ARLP013 Propagation de K7RA

ZCZC AP13
QST de W1AW 
Propagation Forecast Bulletin 13 ARLP013
From Tad Cook, K7RA
Seattle, WA March 26, 2021
To all radio amateurs 

SB PROP ARL ARLP013
ARLP013 Propagation de K7RA

On March 21 and 22 two new sunspot groups, 2811 and 2812 appeared.
Average daily sunspot number this week faded a bit from 19 to 17.9,
but average daily solar flux went from 78.1 to 78.6. Neither change
is significant.

We haven't seen a day with no sunspots since March 1, so that brings
the percentage of spotless days so far this year to 38%, down from
57% last year and 77% in 2019.

Geomagnetic activity was steady throughout this week, with average
daily planetary A index rising from 10.3 to 13.3, and average middle
latitude A index from 7.3 to 10.4.

But geomagnetic conditions we
		
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