Physics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.7519w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A5, p. 7519-7535, 7537-7547.
Physics
10
Earth Magnetosphere, Energy Dissipation, Geomagnetic Tail, Magnetic Energy Storage, Magnetic Field Reconnection, Magnetohydrodynamics, Polar Substorms, Solar Wind, Current Sheets, Electric Field Strength, Electrical Resistivity, Geomagnetic Pulsations, Plasma Compression, Plasma Conductivity, Plasma Pinch, Simulation
Scientific paper
2D electromagnetic particle simulations are used to investigate the dynamics of the tail during development of substorms under the influence of the pressure in the magnetospheric boundary layer and the dawn-to-dusk electric field. It is shown that pressure pulses result in thinning of the tail current sheet as the magnetic field becomes pinched near the region where the pressure pulse is applied. The pinching leads to the tailward flow of the current sheet plasma and the eventual formation and injection of a plasmoid. Surges in the dawn-to-dusk electric field cause plasma on the flanks to convect into the center of the current sheet, thereby thinning the current sheet. The pressure in the magnetospheric boundary laser is coupled to the dawn-to-dusk electric field through the conductivity of the tail. Changes in the predicted evolution of the magnetosphere during substorms due to changes in the resistivity are investigated under the assumption that MHD theory provides a suitable representation of the global or large-scale evolution of the magnetotail to changes in the solar wind and to reconnection at the dayside magnetopause. It is shown that the overall evolution of the magnetosphere is about the same for three different resistivity distributions with plasmoid formation and ejection in each case.
Steinolfson Richard S.
Winglee Robert M.
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