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Science 10 January 2003:
Vol. 299. no. 5604, pp. 239 - 241
DOI: 10.1126/science.1078074
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Reports

Satellite Observations of Magnetic Fields Due to Ocean Tidal Flow

Robert H. Tyler,1* Stefan Maus,2 Hermann Lühr2

The ocean is an electrically conducting fluid that generates secondary magnetic fields as it flows through Earth's main magnetic field. Extracting ocean flow signals from remote observations has become possible with the current generation of satellites measuring Earth's magnetic field. Here, we consider the magnetic fields generated by the ocean lunar semidiurnal (M2) tide and demonstrate that magnetic fields of oceanic origin can be clearly identified in satellite observations.

1 Ocean Physics Department, Applied Physics Laboratory, University of Washington, 1013 NE 40th Street, Seattle, WA 98103, USA.
2 GeoForschungsZentrum (GFZ), Telegrafenberg, 14473 Potsdam, Germany.
*   To whom correspondence should be addressed. E-mail: tyler{at}apl.washington.edu

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