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Large-scale, near-Earth, magnetic fields from external sources and the corresponding induced internal fieldData from MAGSAT analyzed as a function of the Dst index to determine the first degree/order spherical harmonic description of the near-Earth external field and its corresponding induced field. The analysis was done separately for data from dawn and dusk. The MAGSAT data was compared with POGO data. A local time variation of the external field persists even during very quiet magnetic conditions; both a diurnal and 8-hour period are present. A crude estimate of Sq current in the 45 deg geomagnetic latitude range is obtained for 1966 to 1970. The current strength, located in the ionosphere and induced in the Earth, is typical of earlier determinations from surface data, although its maximum is displaced in local time from previous results.
Document ID
19840026736
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Langel, R. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Estes, R. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 4, 2013
Publication Date
April 1, 1983
Subject Category
Geophysics
Report/Patent Number
NAS 1.15:85012
NASA-TM-85012
Accession Number
84N34807
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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