SB PROP @ ARL $ARLP046
ARLP046 Propagation de K7RA

ZCZC AP46
QST de W1AW 
Propagation Forecast Bulletin 46 ARLP046
From Tad Cook, K7RA
Seattle, WA November 12, 2021
To all radio amateurs 

SB PROP ARL ARLP046
ARLP046 Propagation de K7RA

Sunspot activity and solar flux dropped this reporting week
(November 4-10), with the average daily sunspot number retreating
from 67.6 to 36.4, and solar flux from 102 to 89.1. Geomagnetic
indicators rose, average daily planetary A index from 12 to 18, and
middle latitude values from 9 to 11.7.

When the planetary and middle latitude A index were 69 and 42 on
November 4, Alaska's College A index was a whopping 131. College K
index peaked at 9 on that day. K index is logarithmic, so each point
in the scale represents a big difference in activity. The A index is
linear, and based 
		
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