Magnetic fields generated by internal ocean seawater motion
By: Charles A. Davis
Publisher: Naval Postgraduate School; Available from the National Technical Information Service
Published: 1991
Place of publication: Monterey, Calif; Springfield, Va
Language: eng
Number of pages: 71
Description: This thesis models induced magnetic fields from the motion of seawater in the Earth's magnetic field analytically and compares the results to arctic on-the-ice magnetic fluctuation measurements. The oceans have various types of internal motions, such as internal waves and turbulence. This motion of sea water, which is a conductor, in the earth's magnetic field induces a current density. The current density, in turn, induces its own magnetic field. This thesis models internal waves and upper layer ocean turbulence analytically. The corresponding induced magnetic fields are calculated using a static form of Maxwell's equations and parameters for the Arctic are inserted. comparisons are made with measurements from the Arctic Internal Wave Experiment (1985). The predicted fields from internal waves have magnitudes that are measureable and of the same order of magnitude as ionospherically generated fields, The predicted fields from turbulence are several orders of magnitude smaller than ionospherically generated fields. Besides giving information about internal motions in the ocean, the seawater induced fields are a noise source in magnetic anomaly detection.
Notes: Thesis advisor(s): Donald Walters.

:December 1991."

Thesis (M.S. in Physics) Naval Postgraduate School, December 1991.

Bibliography:  p. 68-70.

Approved for public release; distribution unlimited.

US Navy (USN) author.