On the interpretation of the geomagnetic energy spectrum

Details On the interpretation of the geomagnetic energy spectrum On the interpretation of the geomagnetic energy spectrum

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pepi...48..265b&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 48, Issue 3-4, p. 265-278.

Physics

5

Scientific paper

Two recent high-degree magnetic energy spectra, based mostly on MAGSAT data, are compared and found to agree very well out to order and degree n = 15, but the spectrum remains somewhat uncertain for higher degrees. The hypothesis that a primary break in the slope of the spectrum, plotted semi-logarithmically, is due to a transition from dominance by core sources to dominance by crustal magnetization is tested. Simple arrays of dipoles and current loops are found whose combined fields fit the spectrum. Two distinctly different ranges of source depth are found to be adequate. Because one range is shallow and the other deep, the hypothesis is supported.

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