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Geologic and Geomagnetic Background Noise in Two Areas of the North Atlantic.

Abstract : Surface magnetic fields were measured in two areas of the North Atlantic Quiet Zone in order to characterize the level of magnetic interference arising from geological features in the sea floor. Several of the New England seamounts were found to be isolated in their magnetic effects; the surrounding magnetic environment was not significantly different from that found elsewhere in the Quiet Zone. In another area, a sufficient number of tracks was followed to reveal the presence of low-amplitude magnetic features in which a N-NE trend can be discerned and whose wavelength, 30-40 km, is comparable to that found in more active areas to the east. A filtering technique used on the data enabled us to separate geologic from geomagnetic noise, and the difference between interference encountered on quiet and noisy days is quantitatively described. (Modified author abstract)