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Science 28 September 1979:
Vol. 205. no. 4413, pp. 1381 - 1382
DOI: 10.1126/science.205.4413.1381
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Articles

Measurement of Fluctuating Magnetic Gradients Originating from Oceanic Internal Waves

WALTER PODNEY 1 and RONALD SAGER 1

1 Physical Dynamics, Inc., La Jolla, California 92038

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.

Submitted on December 26, 1978
Revised on April 17, 1979

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Science. ISSN 0036-8075 (print), 1095-9203 (online)