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Posting-Version: version B 2.10.1 6/24/83; site mgweed.UUCP
Path: utzoo!watmath!clyde!burl!mgnetp!mgweed!rjr
From: rjr@mgweed.UUCP (Bob Roehrig)
Newsgroups: net.ham-radio
Subject: arrl propagation forecast bulletin nr 21
Message-ID: <9349@mgweed.UUCP>
Date: Tue, 22-May-84 19:05:27 EDT
Article-I.D.: mgweed.9349
Posted: Tue May 22 19:05:27 1984
Date-Received: Wed, 23-May-84 19:23:03 EDT
Organization: AT&T Consumer Products - Montgomery Illinois
Lines: 27


qst de k9eui
hr propagation forecast bulletin nr 21   from arrl headquarters
newington ct may 21, 1984
to all radio amateurs bt

as of may 20, the solar flux has been higher than at  the  same
point in previous solar rotations continuously for 30 days.  in
addition, the daily flux average for all of  1984  to  date  is
some 15 percent above the 1983 daily average.

the flux was rising at bulletin time, but at a slower rate than
in  april,  so the flux curve is likely to drop below that of a
month ago during this week.  as  in  late  april,  major  solar
flares  are  occurring  frequently.   these will bring degraded
propagation on all hf bands may 21 through 26  and  28  through
31.  a major geomagnetic storm in progress as this bulletin was
in preparation brought auroral conditions on 50 and 144 mhz  in
the   northeastern   u.s.    there   was  also  a  late  season
transequatorial 50 mhz opening to south and central america  on
may  19.   sporadic e propagation was almost a daily occurrence
on 28 and 50 mhz after the middle of  may.   it  will  reach  a
broad peak during june.

american sunspot numbers for may 3 through 9  were  between  25
and 79 with a mean of 48.9  ar