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Superposed epoch analysis of pressure and magnetic field configuration changes in the plasma sheetUsing data from 41 substorm events in the near-Earth magnetotail, we have combined plasma, energetic ion, and magnetic field data from the AMPTE/IRM spacecraft to perform a superposed epoch analysis of changes in the total pressure and in the magnetic field configuration as a function of time relative to substorm onset. Unloading is evident in the total pressure profile; the pressure decreases by about 20 percent. Pressure changes during the growth phase are not as uniform for the different substorms as the pressure changes during the expansion phase. To study changes in the magnetic field configuration, we have determined the development of the plasma pressure profiles in z for an average of data from 15 to 19 R(E). At substorm onset, the field line dipolarization begins on the innermost field lines and then progresses to the outer field lines. The field lines map the closest to the Earth about 45 min after substorm onset, and then begin to stretch out again during the recovery phase of the substorm.
Document ID
19930060111
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kistler, L. M.
(New Hampshire Univ. Durham, United States)
Baumjohann, W.
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Nagai, T.
(Meteorological Research Inst. Tsukuba, Japan)
Mobius, E.
(New Hampshire Univ. Durham, United States)
Date Acquired
August 16, 2013
Publication Date
June 1, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: A6
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
93A44108
Funding Number(s)
CONTRACT_GRANT: NAG5-1548
Distribution Limits
Public
Copyright
Other

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