Low frequency geomagnetic fluctuations (0.025 to 20 Hz) on the floor of Monterey Bay
Ames, Morgan P.
Vehslage, Louis McBane
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Two coil antennas consisting of 5460 turns of copper wire were utilized to measure the vertical component and a horizontal component of the fluctuations of the geomagnetic field on the floor of Monterey Bay at a depth of approximately seventy meters. The results indicate that the power spectral density of the fluctuations varies from 1.6 x 10 nT /Hz at 0.01 Hz to 8 x lO" 8 nT2 /Hz at 20 Hz for the horizontal component and from 3.2 x 10 2 nT2 /Hz at 0.01 Hz to 6.3 x 10' s nT2 /Hz at 20 Hz for the vertical. Both components exhibit a monotonic decrease of about 20 dB/decade as the frequency increases, except in the 8-20 Hz region in which the Schumann resonances occur. Measurements of the power spectral density for the vertical component show relatively small excursions from average measurements as a function of wave action, while the horizontal power spectral density varies greatly throughout the day and as a function of seawater motions.
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