SB PROP @ ARL $ARLP038
ARLP038 Propagation de K7RA

ZCZC AP38
QST de W1AW 
Propagation Forecast Bulletin 38 ARLP038
From Tad Cook, K7RA
Seattle, WA September 18, 2020
To all radio amateurs 

SB PROP ARL ARLP038
ARLP038 Propagation de K7RA

Lots of news lately about the solar cycle, but no sunspots. Today,
September 18 is the 29th consecutive day with zero sunspots.

News was about the cycle minimum being announced recently as
occurring during December 2019, which indicates the beginning of
Solar Cycle 25. The reason for the delay in the announcement is the
nature of moving averages, which in this case is a smoothed sunspot
number, derived from arithmetic averaging of sunspot numbers over a
whole year. That is, half the numbers before December and half after
to derive a mid-point average.

Here is the announcement:


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