SB PROP @ ARL $ARLP018
ARLP018 Propagation de K7RA

ZCZC AP18
QST de W1AW 
Propagation Forecast Bulletin 18 ARLP018
From Tad Cook, K7RA
Seattle, WA April 30, 2021
To all radio amateurs 

SB PROP ARL ARLP018
ARLP018 Propagation de K7RA

Sunspots continue every day after April 11, the last day with no
sunspots.

Average daily sunspot number rose this week from 35.1 to 47.6, and
average daily solar flux also rose from 78 to 79.2.

Geomagnetic indicators were quieter, with average daily planetary A
index declining from 16.4 to 10.7. The most active day was April 25
with a planetary A index of 20.

Predicted solar flux over the next month is 77, 75 and 72 on April
30 to May 2, 70 on May 3-6, 72 on May 7-9, 73 on May 10-11, 74 on
May 12-13, 77 on May 14, 79 on May 15-23, 78 on May 24-27, and then
75 and 73 on May 28-29.

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