Long-term behaviour of photo-electron emission from the electric field double probe sensors on GEOS-2

Details Long-term behaviour of photo-electron emission from the electric field double probe sensors on GEOS-2 Long-term behaviour of photo-electron emission from the electric field double probe sensors on GEOS-2

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35...61s&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 35, Jan. 1987, p. 61-70.

Physics

17

Electric Fields, Electron Emission, Geos 2 Satellite, Photoelectrons, Satellite Instruments, Earth Magnetosphere, Interpolation, Plasma Density

Scientific paper

A double probe instrument with a probe separation of 42 m was used aboard the geostationary spacecraft GEOS-2 to measure the ambient electric field. Depending on the plasma density, the potential difference ranges between 1 V and more than 10 V. In the case of the more tenuous plasma, photoelectrons emitted from the probes tend to be picked up by the more positive potential of the wire booms. The net current of this electron flow depends on the spin orientation of the wire booms with respect to the sun. It occurs in the data as a spurious signal and was earlier found to be a function of the spacecraft potential. With data from quiet magnetospheric conditions (Kp not greater than 2) the long-term variation of the spurious signal was investigated. It turned out to be constant during the initial 3 y of the mission. Afterwards, as from 1981, it became smaller and did so for the following 2 y. In 1983, the end of the 5-y period of available data, it had vanished. The cause of the drop is suggested to be a consequence of the partial removal of the conductive surface layer of the wire booms by sputter effects.

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