Solar wind helium ions - Observations of the HELIOS solar probes between 0.3 and 1 AU

Details Solar wind helium ions - Observations of the HELIOS solar probes between 0.3 and 1 AU Solar wind helium ions - Observations of the HELIOS solar probes between 0.3 and 1 AU

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87...35m&link_type=abstract

Journal of Geophysical Research, vol. 87, Jan. 1, 1982, p. 35-51. NASA-supported research; Bundesministerium für Forschung und

Physics

181

Helios Satellites, Helium Ions, Helium Plasma, Ion Distribution, Solar Probes, Solar Wind Velocity, Anisotropic Media, Interplanetary Medium, Temperature Dependence, Time Series Analysis, Velocity Distribution

Scientific paper

A Helios solar probe survey of solar wind helium ion velocity distributions and derived parameters between 0.3 and 1 AU is presented. Distributions in high-speed wind are found to generally have small total anisotropies, with some indication that, in the core part, the temperatures are greater parallel rather than perpendicular to the magnetic field. The anisotropy tends to increase with heliocentric radial distance, and the average dependence of helium ion temperatures on radial distance from the sun is described by a power law. Differential ion speeds with values of more than 150 km/sec are observed near perihelion, or 0.3 AU. The role of Coulomb collisions in limiting differential ion speeds and the ion temperature ratio is investigated, and it is found that collisions play a distinct role in low-speed wind, by limiting both differential ion velocity and temperature.

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