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 20, 2022
To all radio amateurs 

SB PROP ARL ARLP020
ARLP020 Propagation de K7RA

Solar activity was up, up, up this week, with average daily sunspot
numbers increasing from 74.4 to 134.1, and average daily solar flux
from 120.3 to 157.3.

To get some perspective, I averaged the weekly averages for sunspot
number and solar flux from this bulletin and the previous three,
then compared them to the bulletins from one year earlier.

A year ago, the averages for 2021 Propagation Forecast Bulletins
ARLP017 through ARLP020 were 28.9 for sunspot numbers and 75.9 for
solar flux. A year later, the averages are 96.6 for sunspot numbers
and 138.4 for solar flux.

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