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From: rjr@mgweed.UUCP (Bob Roehrig)
Newsgroups: net.ham-radio
Subject: ARRL PROPAGATION BULLETIN NR 12
Message-ID: <7934@mgweed.UUCP>
Date: Tue, 20-Mar-84 09:28:10 EST
Article-I.D.: mgweed.7934
Posted: Tue Mar 20 09:28:10 1984
Date-Received: Wed, 21-Mar-84 01:55:34 EST
Organization: AT&T Consumer Products - Montgomery Illinois
Lines: 27



(Sorry but the end of this transmission was lost)

PROPAGATION BULLETIN NR 12 FROM ARRL HEADQUARTERS  NEWINGTON CT
MARCH 12 1984   TO ALL RADIO AMATEURS

THE PARADE OF SUNSPOTS ACROSS THE VISIBLE SURFACE  OF  THE  SUN
THAT  BROUGHT  SOLAR FLUX PEAKS OF 180 ON JAN 29 AND 175 ON FEB
29 MADE ITS THIRD APPEARANCE LAST WEEK.  STARTING FROM  100  ON
MARCH  10  AND  11,  THE  SOLAR FLUX WAS UP TO 136 ON MARCH 15.
THOUGH ACTIVITY APPEARS LOWER THIS  TIME  AROUND,  FAIRLY  HIGH
FLUX  NUMBERS  SHOULD  BE  WITH  US  UNTIL THE LAST FEW DAYS OF
MARCH.  THIS WILL HELP TO OFFSET THE NORMAL SEASONAL DECLINE IN
OVERALL DX PROPAGATION EXPECTED IN EARLY SPRING.

A GOOD IDEA OF THE EFFECTS OF HIGHER SOLAR FLUX VALUES  CAM  BE
OBTAINED FROM THE PROPAGATION CHARTS IN QST FOR MARCH, PAGE 65.
TAKE A HIGH LATITUDE PATH SUCH AS EASTERN USA TO EUROPE.   NOTE
THAT  THE  PREDICTED  MUF  FOR LATE MARCH IS UNDER 26 MHZ.  FOR
OPTIMUM CONDITIONS AND A SOLAR FLUX OF 108.  EVEN ON  THE  BEST
DAYS,  THE  NORTH  ATLANTIC  PATH WOULD BE BARELY USEABLE ON 28
MHZ, YET MANY CONTRIES OF EUROPE WERE COMING THROUGH  WELL  FOR
SEVERAL  HOURS ON MARCH 18 AS THIS BULLETIN WAS IN PREPARATION.
DX CONDITIONS WERE MARKEDLY BETTER ON ALL LOWER DX  FREQUENCIES
AS WELL.