Quasistatic electric field measurements with spherical double probes on the GEOS and ISEE satellites

Computer Science – Sound

Scientific paper

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Atmospheric Electricity, Electric Fields, Electrical Measurement, Magnetospheric Electron Density, Satellite Sounding, Space Plasmas, Auroral Zones, Geomagnetic Tail, Geos Satellites (Esa), International Sun Earth Explorer 1, Ionospheric Electron Density, Magnetic Storms, Plasma Drift, Plasma Probes, Plasmasphere, Solar Wind

Scientific paper

Spherical double probes for measurements of electric fields on the GEOS-1, GEOS-2, and ISEE-1 satellites are described. An essential feature of these satellites is their conductive surfaces which eliminate errors due to differential charging and enable meaningful diagnostic experiments to be carried out. The result of these experiments is a good understanding of interactions between the plasma, the satellite and the probes, including photo-electron emission on satellite and probes. Electric field measurements are compared with measurements of plasma drift perpendicular to the magnetic field in the solar wind. A useful by-product from a spherical double probe system is the determination of satellite floating potential which is related to the plasma electron flux. This measurement allows high time resolution studies of boundary crossings. Examples of electric measurements are given for different regions of the magnetosphere from the bow shock, the inner magnetosphere and the tail. Several examples of simultaneous GEOS-ISEE observations are described.

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