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Theoretical magnetograms based on quantitative simulation of a magnetospheric substormSubstorm currents derived from the Rice University computer simulation of the September 19, 1976 substorm event are used to compute theoretical magnetograms as a function of universal time for various stations, integrating the Biot-Savart law over a maze of about 2700 wires and bands that carry the ring, Birkeland and horizontal ionospheric currents. A comparison of theoretical results with corresponding observations leads to a claim of general agreement, especially for stations at high and middle magnetic latitudes. Model results suggest that the ground magnetic field perturbations arise from complicated combinations of different kinds of currents, and that magnetic field disturbances due to different but related currents cancel each other out despite the inapplicability of Fukushima's (1973) theorem. It is also found that the dawn-dusk asymmetry in the horizontal magnetic field disturbance component at low latitudes is due to a net downward Birkeland current at noon, a net upward current at midnight, and, generally, antisunward-flowing electrojets.
Document ID
19820058217
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Chen, C.-K.
(NASA National Space Science Data Center Greenbelt, MD, United States)
Wolf, R. A.
(Rice Univ. Houston, TX, United States)
Karty, J. L.
(Rice University Houston, TX, United States)
Harel, M.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena, CA; Rice University Houston, TX, United States)
Date Acquired
August 10, 2013
Publication Date
August 1, 1982
Publication Information
Publication: Journal of Geophysical Research
Volume: 87
Subject Category
Geophysics
Accession Number
82A41752
Funding Number(s)
CONTRACT_GRANT: NGR-44-006-137
CONTRACT_GRANT: F19628-77-C-0005
CONTRACT_GRANT: NSF ATM-79-20157
CONTRACT_GRANT: F19628-80-C-0009
CONTRACT_GRANT: NSF ATM-74-21185
Distribution Limits
Public
Copyright
Other

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