Return-Path: Received: (qmail 9800 invoked from network); 18 Jun 2001 18:00:33 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 18 Jun 2001 18:00:33 -0000 Received: (qmail 12827 invoked from network); 18 Jun 2001 18:00:19 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 18 Jun 2001 18:00:19 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15C3DZ-0001pR-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 18 Jun 2001 18:53:41 +0100 Received: from rhenium.btinternet.com ([194.73.73.93] helo=rhenium) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15C3DY-0001pM-00 for rsgb_lf_group@blacksheep.org; Mon, 18 Jun 2001 18:53:40 +0100 Received: from [213.122.232.167] (helo=default) by rhenium with smtp (Exim 3.22 #9) id 15C3Cm-0002Cy-00 for rsgb_lf_group@blacksheep.org; Mon, 18 Jun 2001 18:52:53 +0100 Message-ID: <000201c0f81f$5dd09800$a7e87ad5@default> From: "Alan Melia" To: "LF-Group" Subject: LF: re Magnetometers Date: Mon, 18 Jun 2001 13:16:16 +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: Hi Andy, I am afraid I have no real knowledge of Magetometers, other than contact for help for people who have wanted to build them. I believe that the Ap and Kp indexes (indicies ??) are a measure of the changes of the earth field due to interaction with solar disturbances. I am not sure whether the field is measured at ground level or not. The other complication is that the major changes do no correlate directly with propagation conditions but I do believe that it may be possible to get up to 24 hours notice of a possible collapse in good conditions........a sort of negative forecast. I'm still working on that one. I will now go and read the gen on the sites quoted by Dick and see if I can learn something too. Cheers de Alan G3NYK Alan.Melia@btinternet.com