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Model simulations of possible electromagnetic induction effects at Magsat activitiesModel simulations are used in a consideration of whether terrestrial induced-current magnetic field effects are significant for near-earth satellite observation, and the nature of the effect at satellite altitudes of lateral differences in the gross conductivity structure of the earth. It is shown that induction in a spherical earth by distant magnetospheric sources can contribute magnetic field fluctuations at Magsat orbit altitudes which are 30-40% of external field amplitudes. It is found that, when phenomenon dimensions are small by comparison with the earth's radius, the earth may be approximated by a plane, horizontal half-space by which electromagnetic energy is reflected with nearly 100% efficiency from the surface. This implies that while the total horizontal field is twice the source field when the source is above the satellite, it is reduced to values smaller than the source field when the source is below the satellite and tends to enhance gross electrical discontinuity signatures in the lithosphere.
Document ID
19820047274
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hermance, J. F.
(Brown University Providence, RI, United States)
Date Acquired
August 10, 2013
Publication Date
April 1, 1982
Publication Information
Publication: Geophysical Research Letters
Volume: 9
Subject Category
Geophysics
Accession Number
82A30809
Funding Number(s)
CONTRACT_GRANT: NAS5-26138
Distribution Limits
Public
Copyright
Other

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