Low Frequency Geomagnetic Fluctuations (.01 to 3 Hz) on the Floor of Monterey Bay.

Abstract

Using a Cs vapor magnetometer, we observed fluctuations of the total magnetic field in the .01 Hz to 3 Hz frequency range on the floor of Monterey Bay, California. Fourteen hours of data were recorded over a period of six months in 1979 at several depths from 30 to 300 meters. A small, inexpensive recording system was designed and manufactured having a noise floor below 0.001 nTin the frequency range of interest. Data analysis includes an ocean wave/geomagnetic fluctuation comparison along with a qualitative analysis of the power spectra of the fourteen hours of geomagnetic fluctuation data. Typical geomagnetic fluctuation spectrum levels were found to be about 1 (nT)-sq/Hz at .01 Hz. As the frequency increased, the magnitude of the spectrum decreased to approximately 0.00001 (nT)-sq/Hz at 3 Hz. Correlation between ocean wave period and peaks in the geomagnetic fluctuation spectra was observed. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1979
Accession Number
ADA081075

Entities

People

  • Edmund J. Chaffee

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Chemistry
  • Data Analysis
  • Detectors
  • Frequency
  • Frequency Bands
  • Magnetic Fields
  • Magnetometers
  • Measurement
  • Military Research
  • Ocean Environments
  • Ocean Waves
  • Oceans
  • Power Spectra
  • Recording Systems
  • Sea Water
  • Seabed
  • Spectrum Analyzers

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Oceanography.