Quasi-thermal noise spectroscopy: preliminary comparison between kappa and sum of two Maxwellian distributions

Mathematics – Functional Analysis

Scientific paper

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Solar Wind, Solar Magnetism, Spacecraft, Functional Analysis, Particle Emission, Solar Wind, Electric And Magnetic Fields, Solar Magnetism, Spacecraft/Atmosphere Interactions, Functional Analysis

Scientific paper

Quasi-thermal noise spectroscopy has been intensively used to measure in situ the solar wind electron density and core temperature in space with various spacecraft. This method allowed study of the large-scale properties of the solar wind. This paper reminds theoretical tools to compute the quasi-thermal noise spectroscopy using a superposition of two Maxwellian distributions to describe the electrons, and the ones using a kappa distribution, which has been recently extended to non integer values of kappa. This paper presents an example of Ulysses data fitted with quasi-thermal noise using a kappa and the sum of two Maxwellians. We make a preliminary comparison of the two results.

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