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!ulysses!mhuxr!mhuxt!houxm!ihnp4!mgnetp!mgweed!rjr From: rjr@mgweed.UUCP (Bob Roehrig) Newsgroups: net.ham-radio Subject: arrl propagation forecast bulletin nr 27 Message-ID: <18648@mgweed.UUCP> Date: Mon, 8-Jul-85 19:49:42 EDT Article-I.D.: mgweed.18648 Posted: Mon Jul 8 19:49:42 1985 Date-Received: Tue, 9-Jul-85 07:14:00 EDT Organization: AT&T Information Systems - Montgomery Illinois Lines: 36 qst de k9eui hr propagation forecast bulletin nr 27 from arrl headquarters newington, ct july 7, 1985 to all radio amateurs bt active areas of the sun responsible for solar flux peaks in early may and june have been on the visible disc of the sun again since july 1. the lead group is shrinking, but the second is larger and more complex than during its june appearance. the solar flux rose from 74 on july 1 to 95 on the 7th, its highest since july of last year. all visible activity is now in the western half of the solar disc, so the flux and sunspot numbers will be lower this week. as predicted last week, geomagnetic activity associated with the more active sun made for erratic dx conditions on our lower frequencies. more stable propagation and lower muf are expected after about july 9. transatlantic dx was worked on 50 mhz during the evening of july 2, and again around midday on the 7th. there was also 50 mhz work to south and central america on the latter date. we may have passed the early summer peak for e layer dx on 28 and 50 mhz, but there will be frequent openings during july. there is no close tie in with solar flux peaks or valleys for the e layer mode, but the four week solar rotation period is worth noting. on that basis we expect a fall off in the middle of july, and a final upsurge at the months end. a gradual change to f layer propagation and longer skip distances will be noticeable on 21 mhz and lower frequencies in august. as e skip drops off, 28 mhz will seem quiet but there is a good possibility of long haul f layer work on that band in the fall months. more details on this prospect will be given in a few weeks. ar