[RSM] W3LPL article update

[Art Boyars]

From: donovanf at erols.com
To: PVRC <pvrc at mailman.qth.net>
Cc:
Bcc:
Date: Thu, 22 Apr 2021 01:18:13 -0400 (EDT)
Subject: [PVRC] Update to the SFI predictions in my May QST Article
The April 2021 NASA solar flux index forecast for solar cycle 25
has been published, mostly advancing the predicted date for solar
maximum to 2024.  The SFI represented by the 50% percentile
(green line) is similar to solar Cycle 24.  A double peaked solar
cycle -- similar to recent Solar Cycles 23 and 24 -- could delay
solar maximum by a year or more.

www.nasa.gov/sites/default/files/styles/full_width/public/thumbnails/image/apr2021f10_prd_plt.png?itok=B7vfEY7Y

Slightly updated wording to my May QST article,
unconstrained by QST page limits and reflecting the
NASA's predicted 2024 solar maximum:
,
If the SFI persists below 90 through December 2021, then
propagation should improve gradually until a solar maximum
weaker than Cycle 24's arrives in 2024.

If the SFI persists above 110 through December 2021, then
propagation should improve rapidly until a solar maximum
similar to Cycle 24's arrives in 2024.

If the SFI persists above 125 through December 2021, then
propagation is likely to improve more rapidly until a solar
maximum stronger than Cycle 24's arrives in 2024.

Don't forget to vote for your favorite May QST article here:

http://www.arrl.org/cover-plaque-poll

73
Frank
W3LPL

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