Statistics – Computation
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.2495l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Feb. 28, 1985, p. 2495-2509. Previously announced in STAR as N84-3173
Statistics
Computation
119
Data Acquisition, Data Processing, Earth (Planet), Equatorial Electrojet, Geomagnetism, Magnetic Anomalies, Magnetic Fields, Mathematical Models, Computation, Correction, Data Bases, Data Correlation, Earth Resources Program, Harmonics, Magsat Satellites
Scientific paper
Data from the Magsat spacecraft for November 1979 through April 1980 and from 91 magnetic observatories for 1978 through 1982 are used to derive a spherical harmonic model of the earth's main magnetic field and its secular variation. Constant coefficients are determined through degree and order 13 and secular variation coefficients through degree and order 10. The first degree external terms and corresponding induced internal terms are given as a function of Dst. Preliminary modeling using separate data sets at dawn and dusk local time showed that the dusk data contains a substantial field contribution from the equatorial electrojet current. The final data set is selected first from dawn data and then augmented by dusk data to achieve a good geographic data distribution for each of three time periods: (1) November/December, 1979; (2) January/February, 1980; (3) March/April, 1980. A correction for the effects of the equatorial electrojet is applied to the dusk data utilized. The solution included calculation of fixed biases, or anomalies, for the observation data.
Estes Ronald H.
Langel Robert A.
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