Computer Science
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981esasp.164...97g&link_type=abstract
In ESA The Solar System and its Exploration p 97-104 (SEE N82-26087 16-88)
Computer Science
Geos Satellites (Esa), Planetary Magnetic Fields, Plasma Drift, Earth Magnetosphere, Electric Fields, Satellite Antennas, Satellite-Borne Instruments
Scientific paper
The GEOS satellites instrumentation is described. Plasma drift velocity and electric field are measured simultaneously and independently. The electric field sensor is an antenna made of two spherical probes separated by a distance of 40 m along a direction perpendicular to the spin axis. The field component measured by the aerial is derived from the difference between the electric potential of the two electrodes. The strength and orientation of the total field vector is computed, assuming that the electric and ambient magnetic fields are perpendicular. Plasma drift is measured, using four electron guns and one electron detector. The drift is evaluated by injecting an artificial beam with a 90 deg pitch angle and measuring its displacement after one or two gyrations.
Grard Rejean
Haerendel Gerhard
Melzner F.
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