Physics
Scientific paper
Jun 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973pepi....7..167h&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 7, Issue 2, p. 167-186.
Physics
6
Scientific paper
The tidal motion of sea water across the earth's magnetic field is known to induce small electric currents to flow in the oceans and the surrounding land. There has been recently a great deal of interest in this phenomenon. Here we consider a model ocean in the form of an infinitely long channel with a tidal wave passing along it. It is shown that for the lunar tidal frequency of 12.45 hours the solution of this problem for typical ocean depths exhibits characteristics which are essentially due to the high frequency. The solution therefore differs appreciably from low-frequency solutions which are therefore only applicable as models of the shallow seas. In our model we observe concentrations of electric current near the coast and phase changes relative to the oceanic tide. A new ``equivalent field exclusion principle'' is presented and used to explain some of the results we have obtained. The method used is simple and applies readily to waves of any frequency, and results are given for waves of higher frequencies. The amplitude and phase lag of the magnetic field of a channel simulating the Atlantic Ocean are discussed.
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