Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83; site mgweed.UUCP
Path: utzoo!watmath!clyde!cbosgd!ihnp4!mgnetp!mgweed!rjr
From: rjr@mgweed.UUCP (Bob Roehrig)
Newsgroups: net.ham-radio
Subject: arrl propagation forecast bulletin nr 37
Message-ID: <20444@mgweed.UUCP>
Date: Mon, 16-Sep-85 18:29:54 EDT
Article-I.D.: mgweed.20444
Posted: Mon Sep 16 18:29:54 1985
Date-Received: Wed, 18-Sep-85 02:22:58 EDT
Organization: AT&T Information Systems - Montgomery Illinois
Lines: 36


qst de k9eui
hr propagation forecast bulletin nr 37  from arrl headquarters
newington ct  september 16, 1985
to all radio amateurs  bt

after more than a month with  almost  no  sunspot  activity,  a
small  but  plainly visible spot appeared near the east limb of
the sun september 13.  the solar  flux  had  been  down  to  68
september  11  and 12, but it rose to 70 and held there for the
next few days.  even this small flux rise affected  propagation
noticeably.  the 21 mhz band was active over much of the world,
and 24 and 28 mhz were open to south and central america daily.

the solar flux average for the first half of september was just
over 70, and most of the period was below corresponding days of
the previous solar rotation.  it is likely  that  we  will  see
somewhat higher numbers after september 20, but no major change
is expected.  higher geomagnetic activity will make for erratic
propagation through the balance of september.

the best advice for anyone trying to work out on 21, 24  or  28
mhz is to keep at it.  the 5, 10, 15 and 20 mhz signals of wwv,
wwvh, and other worldwide time  and  frequency  stations  often
give good indications of the dx potential of amateur bands near
these frequencies.

though solar activity is very low currently, and  it  has  been
for  more  than  a month, this does not necessarily indicate an
early end for cycle 21.  lows so far have not been as  deep  or
as  long as those recorded in the final months of cycles 18, 19
and 20.

american sunspot numbers for september 5 to 11 were  between  0
and 2 with a mean of 0.3  ar


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