Quiet-time convection electric field properties derived from keV electron measurements at the inner edge of the plasma sheet by means of GEOS-2

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Atmospheric Electricity, Convection, Electric Field Strength, Electron Energy, Electron Plasma, Geomagnetism, Geos 2 Satellite, Plasma Layers, Energy Spectra, High Temperature Plasmas, Magnetic Disturbances, Magnetic Signatures, Magnetospheric Electron Density, Plasma-Electromagnetic Interaction

Scientific paper

Results are given of an analysis of the electron upper energy limit local time distribution reached by the GEOS-2 satellite, in cutting through the innermost element of the electron plasma sheet during quiet conditions. It is found that an electric field model whose dusk singular point of the forbidden region lies at 1500 rather than 1800 M.L.T. is in agreement with observations, implying that effects due to the shielding, by the hot plasma, of the inner magnetosphere from the convection electric field are strong in low-disturbance level situations. The analysis yields a quiet-period electric field strength, at 2100 M.L.T. in the geostationary orbit, of between 0.15 and 0.3 kV/R(e), where six hours prior or subsequent to this point in the satellite orbit the convection field is four times stronger.

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