Physics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.6802b&link_type=abstract
Journal of Geophysical Research, vol. 86, Aug. 1, 1981, p. 6802-6808. Research supported by the Deutsche Forschungsgemeinschaft
Physics
171
Computerized Simulation, Geomagnetic Tail, Magnetic Field Inversions, Magnetohydrodynamic Stability, Three Dimensional Models, Geomagnetism, Lines Of Force, Magnetic Storms, Plasma Currents, Plasma Layers, Two Dimensional Models
Scientific paper
A three-dimensional, time-dependent, nonlinear, resistive MHD model is used to study the unstable dynamic evolution of the magnetotail in response to a sudden occurrence or enhancement of resistivity. Many features that are believed to characterize the expansion phase of substorms were found to develop without any driving mechanism at the boundary. Results show that: (1) negative B(z) does not prevail throughout the entire region of tailward-flowing plasma; (2) neutral lines, forming periodically at an approximately fixed earthward location, move tailward at high speed; and (3) the increase of parallel currents and of the flow velocity can occur before neutral lines form. This three-dimensional model confirms and extends the results of the Birn (1980) two-dimensional model.
Birn Joachim
Hones Edward W. Jr.
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