'Collisionless electron heat conduction' and the polytrope law

Computer Science

Scientific paper

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Conductive Heat Transfer, Electron Density (Concentration), Electron Pressure, Polytropic Processes, Solar Wind, Electron Distribution, Electron Scattering

Scientific paper

The expression of the so-called collisionless electron heat conduction, which was proposed by Hollweg in 1976 based on qualitative analysis, is deduced from the moment equations of the electron distribution function under the assumption of the existence of the polytrope law between the electron thermal pressure and electron density. Comparison of the expression deduced here with Hollweg's expression indicates that the unknown dimensionless factor in the latter is determined by the polytrope index. The applicability of the 'collisionless electron heat conduction' and the mechanism of the electron heat transport in the solar wind are discussed in detail.

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