Problems of cold plasma measurements on the Regatta-A spacecraft

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cluster Mission, Cold Plasmas, Debye Length, Field Aligned Currents, Magnetospheric Ion Density, Plasma Waves, Scientific Satellites, Auroral Zones, Density Distribution, Earth Magnetosphere, Electron Distribution, European Space Programs, Flow Distribution, Rarefied Plasmas, Space Plasmas, Spaceborne Astronomy

Scientific paper

General physical processes and models which govern the thermal plasma number density distribution, field aligned flows and perpendicular drifts in the magnetosphere are outlined. The decisive role of the spacecraft electric potential and the Debye length for the thermal ion measurements onboard are considered. An approach to evaluate experimentally the necessary corrections to the three dimensional ion measurements is described. Cold electron distributions in the auroral environment are considered and their relation to the spacecraft potential in rarified plasmas is discussed. Advantages of the proposed Regatta A instrumentation are presented.

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