A comparison of satellite and observatory estimates of geomagnetic secular variation

Details A comparison of satellite and observatory estimates of geomagnetic secular variation A comparison of satellite and observatory estimates of geomagnetic secular variation

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.2523b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Feb. 28, 1985, p. 2523-2526.

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Geomagnetism, Magnetic Variations, Magsat Satellites, Secular Variations, Observatories, Spherical Harmonics

Scientific paper

A comparison is made between secular variation values computed at the positions of 168 magnetic observatories from two spherical harmonic models based almost entirely on the 7-month spread of Magsat data and observed secular variation values derived from the observatory annual mean values. The two models differ from each other (rms difference in Z = 27.8 nT/yr) and from the observed values (rms differences in Z of 22.1 and 30.6 nT/yr). It appears that a time span of more than 7 months is needed to produce accurate models of the secular variation from satellite data.

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