SB PROP @ ARL $ARLP037
ARLP037 Propagation de K7RA

ZCZC AP37
QST de W1AW 
Propagation Forecast Bulletin 37 ARLP037
From Tad Cook, K7RA
Seattle, WA September 15, 2023
To all radio amateurs 

SB PROP ARL ARLP037
ARLP037 Propagation de K7RA

Like last week, eight new sunspot groups emerged this reporting
week, September 7-13.

One appeared on September 7, another September 9, four more on
September 10, another on September 11 and one more on September 12.

Solar activity made a nice comeback, with average daily sunspot
numbers rising from 95.4 to 138.1, and solar flux from 137.6 to
159.9.

The most active geomagnetic day was September 12, when the planetary
A index was 25. Spaceweather.com reported a "stealth CME"
(unexpected) that had aurora visible down as far as Missouri.

Average daily planetary A index de
		
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