Return-Path: Received: (qmail 11530 invoked from network); 16 May 2001 18:35:58 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 16 May 2001 18:35:58 -0000 Received: (qmail 11594 invoked from network); 16 May 2001 18:35:29 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 16 May 2001 18:35:29 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15063W-0001dh-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 16 May 2001 19:29:54 +0100 Received: from mta1-svc.virgin.net ([62.253.164.41]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15063T-0001dY-00 for rsgb_lf_group@blacksheep.org; Wed, 16 May 2001 19:29:51 +0100 Received: from p.cleal ([62.255.20.194]) by mta1-svc.virgin.net (InterMail vM.4.01.02.27 201-229-119-110) with SMTP id <20010516182917.VXAD267.mta1-svc.virgin.net@p.cleal> for ; Wed, 16 May 2001 19:29:17 +0100 Message-ID: <000201c0de36$35cb73a0$c214ff3e@p.cleal> From: "Peter Cleall" To: rsgb_lf_group@blacksheep.org Subject: Re: SV: LF: SV: Re. T/A tests. Date: Wed, 16 May 2001 10:20:10 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.5 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: When I was working on the decay of satellite orbits about 10 years ago the drag on the satellite, required an equation that accounted for 11 year, time of year and recent solar effects both flux and geomagnetic. In that particular case the flux turned out to be the best parameters for the general changes over reasonable periods of time. Using something in the form [3 monthly mean solar flux + 0.4*[difference between the 3 day mean flux and the 3 monthly figure]]. Retrospective analysis showed the deviations from this ,mainly occurred due to daily differences from the mean and also from random solar/geomagnetic influences. We may be able to deduce something similar with one or more of the Solar parameters to solve our long term understanding of our propagation medium. regards peter cleall G8AFN -----Original Message----- From: john sexton To: rsgb_lf_group@blacksheep.org Date: 15 May 2001 19:15 Subject: Re: SV: LF: SV: Re. T/A tests. > >Hi Chris, >Terman's graphs show that T/A sig levels are strongest during peaks of the >solar cycle. Whereas the correlation that Laurie described is T/A success >when sunspot numbers are low. >My guess is that both are probably true, i.e. on average T/A signal levels >are better during the active part of the cycle, but conversely weak signals >are more likely to be disrupted during the active part. >We will probably find that at the low point of the cycle chances of getting >across are worse but consistently worse, if you follow me. >73, John > > > > > >_______________________________________________________ >Send a cool gift with your E-Card >http://www.bluemountain.com/giftcenter/ > > >