Event Title

Recent Models of Magnetospheric Convection

Presenter Information

Richard A. Wolf, Rice University

Location

Yosemite National Park

Start Date

2-7-1974 10:15 AM

End Date

2-7-1974 10:45 AM

Description

A set of computer models of magnetospheric electric fields is reviewed. In each calculation, a potential distribution is assumed at the boundary of the polar cap. Electrostatic potentials equatorward of this boundary are computed from Vj=0, with ionospheric, Birkeland, and ring currents taken self-consistently into account. Neutral winds and parallel electric fields are neglected, and the plasma-sheet particles are approximated by a one-component ion sheet. In the models, the region earthward of the inner edge of the ion sheet is shielded from the convection electric field. The shielding requires from a few minutes to a few hours to react to a change in convection field, but is nearly complete in steady-state condition, except when ionospheric conductivity is very high. Both plasma-sheet and Davis-Williamson protons should contribute to the shielding of the low-latitude ionosphere from convection electric fields.

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Feb 7th, 10:15 AM Feb 7th, 10:45 AM

Recent Models of Magnetospheric Convection

Yosemite National Park

A set of computer models of magnetospheric electric fields is reviewed. In each calculation, a potential distribution is assumed at the boundary of the polar cap. Electrostatic potentials equatorward of this boundary are computed from Vj=0, with ionospheric, Birkeland, and ring currents taken self-consistently into account. Neutral winds and parallel electric fields are neglected, and the plasma-sheet particles are approximated by a one-component ion sheet. In the models, the region earthward of the inner edge of the ion sheet is shielded from the convection electric field. The shielding requires from a few minutes to a few hours to react to a change in convection field, but is nearly complete in steady-state condition, except when ionospheric conductivity is very high. Both plasma-sheet and Davis-Williamson protons should contribute to the shielding of the low-latitude ionosphere from convection electric fields.