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Re: Magnetic Variation
From: Paul Saffo
Date: 2010 Feb 27, 18:33 -0800

There is a short description of annual mean field variation on the usgs gromagnetic observatory site. See:

http://geomag.usgs.gov/intro.php#field

But the shift is quite small, well below what I would imagine might matter to navigators, so not surprised that Dutton, et. al didn't mention it.

best

-p

On Feb 27, at , Guy Schwartz wrote:

Hello all:
I just took a test today and one of the questions had to do with magnetic variation. The answer to the question was that magnetic variation changed seasonally. I checked Chapman’s, Dutton’s and Bowditch, no mention of seasonally adjusting?
Anyone have any information or was the test wrong?
Thanks
Guy

"May the SCHWARTZ BE WITH YOU"

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