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!we13!mgweed!rjr 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.