Solar wind and magnetosphere plasma diagnostics by spacecraft electrostatic potential measurements

Details Solar wind and magnetosphere plasma diagnostics by spacecraft electrostatic potential measurements Solar wind and magnetosphere plasma diagnostics by spacecraft electrostatic potential measurements

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995angeo..13..118p&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 13, no. 2, p. 118-129

Physics

74

Earth Magnetosphere, Electric Fields, Electron Density (Concentration), Electron Flux Density, Electrostatic Probes, Photoelectrons, Plasma Diagnostics, Plasma Potentials, Solar Wind, Crres (Satellite), Geos 1 Satellite, Geos 2 Satellite, International Sun Earth Explorer 1, Solar Radiation, Sun

Scientific paper

Several satellites (GEOS-1, GEOS-2, ISEE-1, Viking and CRRES) carried electric field experiments on which probes were driven by a current from the satellite to be close to the plasma potential. The potential difference between an electric field probe and its spacecraft (with conductive surfaces) can be used to determine the ambient electron density and/or electon flux with limited accuracy but with high time resolution, of the order of 10-100ms. It is necessary for the development of this diagnostic method to understand the photoemission characteristics of probes and satellites. According to the electric field experiments on the above-mentioned satellites, all materials develop very similar photoemission properties when they are beyond the influence of atmospheric oxygen. The photoelectron yield steadily increases over the first few months in space and reaches values well above those measured on clean surfaces in the laboratory. The method can be used for solar radiation levels corresponding to distances from 0.4 to 5 AU from the Sun.

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