Calculation and observation of thermal electrostatic noise in solar wind plasma

Physics – Plasma Physics

Scientific paper

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Dipole Antennas, Electromagnetic Noise Measurement, Electrostatic Waves, Plasma Diagnostics, Solar Wind, Thermal Noise, Imp, Ion Acoustic Waves, Noise Spectra, Satellite Observation, Shot Noise

Scientific paper

Calculations, both approximate algebraic and numerical, have been carried out for the noise due to electrostatic waves incident on a dipole antenna. The noise is calculated both for a thermal equilibrium plasma, and one having several components at different temperatures. The results are compared with measurements from the IMP-6 satellite. In various frequency ranges, the noise power is dominated by Langmuir oscillations, by electron acoustic waves and by ion acoustic waves. The measurements are consistent with all of these, although the ion waves are not definitely observed, due to interference from shot noise.

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