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Quasi-static MHD processes in earth's magnetosphereAn attempt is made to use the MHD equilibrium theory to describe the global magnetic field configuration of earth's magnetosphere and its time evolution under the influence of magnetospheric convection. To circumvent the difficulties inherent in today's MHD codes, use is made of a restriction to slowly time-dependent convection processes with convective velocities well below the typical Alfven speed. This restriction leads to a quasi-static MHD theory. The two-dimensional theory is outlined, and it is shown how sequences of two-dimensional equilibria evolve into a steady state configuration that is likely to become tearing mode unstable. It is then concluded that magnetospheric substorms occur periodically in earth's magnetosphere, thus being an integral part of the entire convection cycle.
Document ID
19890023893
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Voigt, Gerd-Hannes
(Rice University Houston, TX, United States)
Date Acquired
August 13, 2013
Publication Date
August 1, 1988
Publication Information
Publication: Laser and Particle Beams
Volume: 6
ISSN: 0263-0346
Subject Category
Geophysics
Accession Number
89A11264
Funding Number(s)
CONTRACT_GRANT: NSF ATM-87-01208
CONTRACT_GRANT: NAGW-482
Distribution Limits
Public
Copyright
Other

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