Measurements of quasi-static electric fields between 3 and 7 earth radii on GEOS-1

Details Measurements of quasi-static electric fields between 3 and 7 earth radii on GEOS-1 Measurements of quasi-static electric fields between 3 and 7 earth radii on GEOS-1

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ssrv...22..333p&link_type=abstract

(ESA, ESLAB Symposium on Advances in Magnetospheric Physics with GEOS-1 and ISEE-1 and 2, 13th, Innsbruck, Austria, June 5-7, 19

Physics

7

Earth Magnetosphere, Electric Fields, Geos 1 Satellite, Satellite Observation, Magnetic Storms, Magnetohydrodynamic Waves, Plasma Diagnostics

Scientific paper

Quasi-static electric fields have been measured with two spherical probes supported by cable booms providing a baseline of 42 m for the measurement. The performance of the experiment is outlined to demonstrate that electric fields can be measured with accuracies of plus or minus 0.7 mV/m and plus or minus 1.0 mV/m in the dawn-dusk and satellite-sun directions, respectively. These uncertainties can be considerably reduced under favorable plasma conditions. Examples of typical observations are described: (1) the average electric field is always characterized by an irregular structure with time scales 0.5-5 min and with amplitudes of a few mV/m; (2) during substorms dawn-dusk electric fields up to 20-30 mV/m have been observed over intervals of 30-60 s; and (3) oscillating electric fields with peak-to-peak amplitudes up to 10 mV/m and periods of 3-10 min have been observed following magnetospheric disturbances. The observations are discussed in terms of plasma motions and possible spatial scale sizes of the phenomena, standing magnetospheric wave modes and electrostatic potentials.

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