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 24 Message-ID: <9863@mgweed.UUCP> Date: Tue, 12-Jun-84 08:50:58 EDT Article-I.D.: mgweed.9863 Posted: Tue Jun 12 08:50:58 1984 Date-Received: Wed, 13-Jun-84 00:21:10 EDT Organization: AT&T Consumer Products - Montgomery Illinois Lines: 31 qst de k9eui hr propagation bulletin nr 24 from arrl headquarters newington ct june 11 1984 to all radio amateurs bt from early january through late may, the sun was more active than would have been expected so late in the solar cycle, but it lost most of its spots in the last two weeks. the solar flux was 66 points lower on may 27 than on april 29, one solar rotation earlier, and down to 90 on june 10. this was its lowest level since january 10. the best part of this picture is that the effekts of lower solar flux and lower sunspot numbers are minimal at this season. if the sun should recover somewhat in the autumn, it will do more for northern hemisphere dx then than now. more on this prospect will be given in late summer bulletins. a portion of the sun with that flux peak of 140 on may 21 will come into view about june 14. for the week, it is expected that hf propagation will be fair to good june 11 to 13, but recurrent geomagnetic disturbances are due june 16 through 21. sporadic e layer ionization increases gradually in june, helping to keep things happening on 21, 28, 50 and possibly 144 mhz almost regardless of flux or sunspot numbers. american sunspot numbers for may 31 through june 6 were between 24 and 48 with a mean of 37.3. ar