ZCZC AP02
QST de W1AW
Propagation Forecast Bulletin 2 ARLP002
From Tad Cook, K7RA
Seattle, WA January 10, 2025
To all radio amateurs
SB PROP ARL ARLP002
ARLP002 Propagation de K7RA
Solar activity was a bit weak during recent days. Average daily sunspot number
Predicted solar flux for the near term is 165 on January 10-11, 160 on January
Predicted planetary A index is 8 on January 10-11, then 10 on January 12-13, 5
Weekly Commentary on the Sun, the Magnetosphere, and the Earth's Ionosphere - J
"For most of the eleven-year solar cycle, two numbers are more or less sufficie
"It may not yet be enough to understand what is going on, let alone predict it.
"Yet, or perhaps because of this, we often experience surprises, whether a lull
"A further upsurge in solar activity is not expected until the second half of J
"Solar Observances" from the Royal Observatory of Belgium:
https://www.sidc.be
For more information concerning shortwave radio propagation, see www.arrl.org/p
An archive of past propagation bulletins is at www.arrl.org/w1aw-bulletins-arch
Also, check this article: "Understanding Solar Indices" from September 2002 QST
https://bit.ly/3Rc8Njt
Instructions for starting or ending email subscriptions to ARRL bulletins are a
Sunspot numbers for January 2 through 8, 2025 were 173, 190, 193, 178, 154, 113 NNNN
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