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!burl!mgnetp!mgweed!rjr
From: rjr@mgweed.UUCP (Bob Roehrig)
Newsgroups: net.ham-radio
Subject: arrl propagation forecast bulletin nr 23
Message-ID: <9672@mgweed.UUCP>
Date: Tue, 5-Jun-84 18:11:17 EDT
Article-I.D.: mgweed.9672
Posted: Tue Jun  5 18:11:17 1984
Date-Received: Wed, 6-Jun-84 05:14:42 EDT
Organization: AT&T Consumer Products - Montgomery Illinois
Lines: 31


qst de k9eui
hr propagation forecast bulletin nr 23   from arrl headquarters
newington ct  june 4, 1984
to all radio amateurs bt

the solar flux average for may was 129.4, but flux values  have
been  falling  since may 21 and the reading for june 2 was 107.
in late april we had readings as high as 183, a  high  for  the
past  17  months.   such  peaks have kept the daily average for
1984 at around 127.  this is nearly two points above the  early
1983  average,  despite  the  fact  that cycle 21 is now nearly
eight years old.

solar flux values during the past week, 120 to  107,  are  more
like  what  is expected this late in the cycle, but flux levels
are  not  a  major  propagation  factor  during  the   northern
hemisphere summer.

of more interest at this season is the activity of  the  earths
magnetic field, which will be lower early in the forecast week,
making for generally better conditions on  all  hf  bands.   it
will  rise again june 5 to 7, resulting in poorer high latitude
propagation until about june 8.

sporadic e layer ionization will continue to provide short skip
on 28 and 50 mhz, and the chances for 144 mhz will improve.

american sunspot numbers for may 24 through 30 were between  59
and 83 with a mean of 72.1  ar