Return-Path: Received: (qmail 14785 invoked from network); 18 Jun 2001 09:01:35 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 18 Jun 2001 09:01:35 -0000 Received: (qmail 9204 invoked from network); 18 Jun 2001 09:00:35 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 18 Jun 2001 09:00:35 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15BupF-0005gs-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 18 Jun 2001 09:56:01 +0100 Received: from bob.dera.gov.uk ([192.5.29.90]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15BupD-0005gn-00 for rsgb_lf_group@blacksheep.org; Mon, 18 Jun 2001 09:56:00 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: by bob.dera.gov.uk; (8.8.8/1.3/10May95) id KAA16414; Mon, 18 Jun 2001 10:00:13 +0100 (BST) Received: (qmail 22947 invoked from network); 18 Jun 2001 09:48:27 -0000 Received: from gauntlet.mail.dera.gov.uk (172.16.9.10) by baton.dera.gov.uk with SMTP; 18 Jun 2001 09:48:27 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: by gauntlet.mail.dera.gov.uk; id JAA09633; Mon, 18 Jun 2001 09:39:41 GMT Received: from unknown(10.71.64.31) by gauntlet.mail.dera.gov.uk via smap (3.2) id xma009568; Mon, 18 Jun 01 09:39:14 GMT Received: from mailex.dera.gov.uk (unverified) by mailguard.dera.gov.uk (Content Technologies SMTPRS 4.1.5) with SMTP id for ; Mon, 18 Jun 2001 10:04:02 +0100 Received: (qmail 13962 invoked from network); 18 Jun 2001 08:45:08 +0100 Received: from softdnserror (HELO cchecker.dstl.gov.uk) (192.168.248.52) by mailex.dstl.gov.uk with SMTP; 18 Jun 2001 07:45:08 -0000 Received: from FRN-MAIL-R1.dstl.gov.uk (unverified) by cchecker.dstl.gov.uk (Content Technologies SMTPRS 4.1.2) with ESMTP id for ; Mon, 18 Jun 2001 08:45:30 +0100 Received: by frn-mail-r1.dstl.gov.uk with Internet Mail Service (5.5.2650.21) id ; Mon, 18 Jun 2001 09:54:09 +0100 Message-ID: <7D653C9C42F5D411A27C00508BF8803D55C4E9@pdw-mail-r1.dstl.gov.uk> From: "Talbot Andrew" To: "LF Group \(E-mail\)" Subject: LF: Magnetometer uses Date: Mon, 18 Jun 2001 09:54:15 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Content-Type: text/html; charset=windows-1252 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit

I have been given a small compass module that, apart from magnetic heading, gives a serial digital high resolution output of X and Y components of the Earths magnetic field. Added a simple PIC + S/W to give the outputs in text formatted RS232 for connection to a PC. Whilst idly thinking of something to do with this (apart from a remote compass on my antenna) I wondered about a 2 axis magnetometer monitoring for solar storms etc.

Does anyone on this reflector (Alan ?) know what sort of magnetic field changes are a precursor to magnetic storms, and what sort of sampling interval it is worth averaging over to automatically alert on these. I could easily log X / Y data to disc at a regular interval, write an alerting function etc etc. if there is any worthwhile research advantage in doing so. Otherwise the module will be relegated to being used on 10GHz portable operations, for aiming my dish remotely.

Andy G4JNT





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