SB PROP @ ARL $ARLP025
ARLP025 Propagation de K7RA

ZCZC AP25
QST de W1AW 
Propagation Forecast Bulletin 25 ARLP025
From Tad Cook, K7RA
Seattle, WA June 18, 2021
To all radio amateurs 

SB PROP ARL ARLP025
ARLP025 Propagation de K7RA

Solar activity was lower this week, with average daily sunspot
number declining from 34.9 last week to 13.9 this week. This average
was affected by the one day with no sunspots, Saturday, June 12

Average daily solar flux dropped from 77.7 to 75.2. The Penticton
observatory in British Columbia (the source for 10.7 cm solar flux)
did not report a noon reading on Wednesday, June 16, so we averaged
the morning (76.9 at 1700 UTC) and afternoon readings (77.1 at 2300
UTC) to come up with 77 as a reasonable approximation.

Normally the local noon reading (2000 UTC) is the official number
for t
		
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