Low frequency geomagnetic fluctuations (0.025 to 20 Hz) on the floor of Monterey Bay
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Authors
Ames, Morgan P.
Vehslage, Louis McBane
Subjects
Low Frequency Geomagnetic Measurements
Geomagnetic Fluctuations in an Ocean Environment
Geomagnetic Fluctuations in an Ocean Environment
Advisors
Heinz, O.
Date of Issue
1981-12
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
en_US
Abstract
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.
Type
Thesis
Description
Series/Report No
Department
Physics and Chemistry
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.