Solar wind protons - Three-dimensional velocity distributions and derived plasma parameters measured between 0.3 and 1 AU

Details Solar wind protons - Three-dimensional velocity distributions and derived plasma parameters measured between 0.3 and 1 AU Solar wind protons - Three-dimensional velocity distributions and derived plasma parameters measured between 0.3 and 1 AU

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87...52m&link_type=abstract

Journal of Geophysical Research, vol. 87, Jan. 1, 1982, p. 52-72. NASA-supported research; Bundesministerium für Forschung und

Physics

302

Plasma Diagnostics, Solar Protons, Solar Wind Velocity, Three Dimensional Motion, Velocity Distribution, Energy Spectra, Helios Satellites, Proton Energy, Solar Corona, Temperature Dependence

Scientific paper

Such nonthermal features as temperature anisotropies, heat fluxes, and proton double streams have been observed by a Helios solar probe survey of solar wind three-dimensional proton velocity distributions between 0.3 and 1 AU. It is found that a strong anisotropy in the core of proton distributions, with a temperature that is larger perpendicular rather than parallel to the magnetic field, is a persistent feature of high-speed streams, becoming most pronounced in the perihelion, or about 0.3 AU. Isotropic distributions have been detected only close to, and at, magnetic sector boundaries, and the flattest radial temperature profiles are found in high-speed streams. These observations indicate that local heating or proton heat conduction occurs in the solar wind.

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