I used my own magnetometer hooked up to a laptop and got actual magnetic
field numbers as they occurred. You can make one for about $100. I do not
have it running now, but plan to re install it in the Spring as soon as the
ground thaws out. I buried mine in the garden to keep the temperature more
or less constant. It also was away from any moving metal (like cars and
lawnmowers) I wrote it up here:
http://www.directivesystems.com/PDF/MAGTALK.PDF
A company in Britain makes the sensors and supplies some ASICs and PC
boards. It makes for a fun project. It sure is obvious when a magnetic storm
commences. I used it for predicting auroras and chasing DX on 144 MHz.
73
Dave K1WHS
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Topband Reflector
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