Allowance for ionic current in determinations of electron temperature by means of a cylindrical Langmuir probe

Computer Science – Sound

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Cylindrical Plasmas, Electron Energy, Electrostatic Probes, Ion Currents, Satellite Sounding, Space Plasmas, Intercosmos Satellites, Least Squares Method, Linear Equations, Plasma Potentials

Scientific paper

Two different methods for the approximate determination of ionic current were used to reduce data from the cylindrical Langmuir probe of the Intercosmos-10 satellite. An analysis of the influence of ionic-current corrections on the resulting values of electron temperature is presented. The theory of a Langmuir probe moving in a plasma gives a complex dependence of ionic current on probe potential. Therefore, it is, in general, not possible to use the least squares method to determine the coefficients in the equations describing this dependence; in addition, an unambiguous extrapolation of ionic current in the range where probe potential is less than plasma potential is not possible.

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