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| Titel |
Solar wind and magnetosphere plasma diagnostics by spacecraft electrostatic potential measurements |
| VerfasserIn |
A. Pedersen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 13, no. 2 ; Nr. 13, no. 2, S.118-129 |
| Datensatznummer |
250011742
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| Publikation (Nr.) |
 copernicus.org/angeo-13-118-1995.pdf |
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| Zusammenfassung |
| 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 electron flux with limited accuracy but with high time resolution, of the
order of 10-100 ms. 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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