Backus effect observed by Magsat

Details Backus effect observed by Magsat Backus effect observed by Magsat

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..941.&link_type=abstract

Geophysical Research Letters, vol. 7, Nov. 1980, p. 941-944.

Physics

Geomagnetism, Magnetic Surveys, Earth Surface, Instrument Errors, Magnetometers, Root-Mean-Square Errors, Spherical Harmonics

Scientific paper

Two harmonic expansions of the geomagnetic potential, obtained from Magsat, are compared, one based on scalar data and one based on vector data. It is found that although the field magnitudes given by the two models are in close agreement, the vector fields are not; the vector difference was highly regular. Analysis of the data showed that the Backus effect (1970) accounted for most of the discrepancy. This result emphasizes the importance of using vector data in deriving global models of the geomagnetic field and suggests that some past models based on scalar data alone may suffer from errors of a similar nature.

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