Geoelectric power spectra over oceanic distances

Details Geoelectric power spectra over oceanic distances Geoelectric power spectra over oceanic distances

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..421f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 4, p. 421-424

Physics

6

Geoelectricity, Geomagnetism, Geopotential, Ocean Bottom, Pacific Ocean, Power Spectra, Submarine Cables, Communication Cables, Magnetic Effects, Magnetohydrodynamic Waves

Scientific paper

We present initial results of simultaneous measurements of the geoelectric potential as measured across two long cable routes in the Pacific (Guam to Philippines and California to Hawaii) separated by approximately 6h in local time and approximately 30 deg in latitude. Over the frequency range approximately 10(exp -5) to 1.67 x 10(exp -3) Hz the power levels tend to be enhanced near local noon along the two routes, especially during geomagnetic quiet intervals. During the seven days analyzed, geoelectric power levels up to 10(exp 4) (mV/km)(exp 2)/km were measured on a geomagnetically disturbed day. The power levels at the longest periods, approximately 17 m to approximately 150 m, are generally found to be largest along the route at lower geomagnetic latitudes (Guam to Philippines) when comparisons are made at equivalent local times. In contrast, the power levels for periods in the hydromagnetic wave region (periods less than or approximately = 5 m) tend to be larger at all local times for the higher geomagnetic latitude route. The nightside geoelectric power levels along the higher latitude route tend to increase with increasing geomagnetic activity.

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