Physics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.3441b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, April 1, 1985, p. 3441-3447. Sponsorship: Deutsche Forschungsgemeinsc
Physics
26
Geomagnetic Tail, Magnetic Field Configurations, Magnetohydrodynamic Waves, Neutral Sheets, Plasma-Electromagnetic Interaction, Electric Fields, Electromagnetic Interactions, Lorentz Force, Plasma Layers, Pressure Gradients, Time Dependence
Scientific paper
Birn and Schindler (1983) have presented a self-consistent theory of convection in the geomagnetic tail for relatively quiet times. Conditions are considered when the flow speeds are small in comparison to typical MHD wave speeds, and a quasi-static approximation neglecting inertia terms in the equation of motion is valid. In the present investigation, a time-dependent nonlinear ideal two-dimensional MHD code is used to study the response of the magnetotail to an externally applied dawn-to-dusk electric field Ev. It is found that for Ev approximately equal to or less than 1 mV/m the quasi-static approximation is generally a good approximation as long as no tail instabilities are generated. Assuming that the near-earth boundary is essentially closed to particle losses, it is found that the magnetotail changed in time consistent with changes which are believed to characterize the substorm growth phase.
Birn Joachim
Schindler Karl
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