Ionosphere-plasmasheet field-aligned currents and parallel electric fields

Details Ionosphere-plasmasheet field-aligned currents and parallel electric fields Ionosphere-plasmasheet field-aligned currents and parallel electric fields

Nov 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974p%26ss...22.1485l&link_type=abstract

Planetary and Space Science, vol. 22, Nov. 1974, p. 1485-1490.

Computer Science

16

Atmospheric Models, Collisionless Plasmas, Field Aligned Currents, Ionospheric Conductivity, Plasma Conductivity, Plasma Interactions, Upper Ionosphere, Current Density, E Region, Earth Magnetosphere, Electric Current, Electric Fields, Ionospheric Electron Density, Lines Of Force, Plasma Temperature

Scientific paper

Two kinetic models for the auroral topside ionosphere are compared. The collisionless plasma distributed along an auroral magnetic field line behaves like a non-Ohmic conducting medium with highly nonlinear characteristic curves relating the parallel current density to the potential difference between the cold ionosphere and the hot plasma-sheet region. The potential difference required to balance the current carried by the precipitating plasma-sheet particles and the current transported by the outflowing ionospheric particles depends on the ratio of the plasma-sheet and ionospheric electron densities and temperatures. When in the E-region the magnetic field lines are interconnected by a high-conductivity plasma, the resulting field-aligned currents driven by the magnetospheric potential distribution are limited by the integrated Pedersen conductivity of the ionospheric layers. These currents are not related to the parallel electric field intensity, as they would be in Ohmic materials. The parallel electric field intensity is necessarily determined by the local quasi-neutrality of the plasma.

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