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Measurement of fluctuating magnetic gradients originating from oceanic internal waves.

Authors
  • Podney, W
  • Sager, R
Type
Published Article
Journal
Science (New York, N.Y.)
Publication Date
Sep 28, 1979
Volume
205
Issue
4413
Pages
1381–1382
Identifiers
PMID: 17732332
Source
Medline
License
Unknown

Abstract

Fluctuating magnetic gradients over oceans come from electric currents flowing in seawater arising from its motions across the earth's magnetic field. Gradients of 0.3 to 0.6 picoteslas per meter for each meter of internal wave displacement have been measured at frequencies of 2 to 5 millihertz with a superconductive magnetic gradiometer supported 7 meters above the surface of water 18 meters deep about 1.5 kilometers offshore from San Diego, California.

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