SB PROP @ ARL $ARLP051
ARLP051 Propagation de K7RA

ZCZC AP51
QST de W1AW 
Propagation Forecast Bulletin 51 ARLP051
From Tad Cook, K7RA
Seattle, WA December 22, 2023
To all radio amateurs 

SB PROP ARL ARLP051
ARLP051 Propagation de K7RA

The Winter Solstice, the shortest day of the year in the Northern
Hemisphere occurred at 0327 UTC on December 22. It is the start of
summer in the Southern Hemisphere.

Solar activity increased over the last reporting week (December
14-20), with eleven new sunspot groups emerging.

One new sunspot group appeared on December 15, four more on the
following day, another on December 17, three more on December 18,
and two more in December 19-20.

Average daily sunspot number rose from 110.3 to 137.4, solar flux
from 129.8 to 162.7, planetary A index 5.6 to 18.4, and middle
latitude A inde
		
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