Lunar and solar daily variation in the magnetotelluric field beneath the ocean

Abstract

Magnetic and electric field fluctuations have been observed by instruments installed on the sea floor at a station 600 km off the California coast (32°46′N, 127°07′W, at 4.4 km depth); see Figure 1. The magnetic fluctuations were recorded for 25 days during May 1965 by a newly developed magnetometer (J. Filloux, in preparation) which registered D (horizontal component of variation normal to average magnetic north. Magnetic north is 16°T at recorder location. T indicates true azimuth measured clockwise with respect to geographic north).