Pronounced proton core temperature anisotropy, ion differential speed, and simultaneous Alfven wave activity in slow solar wind at 0.3 AU

Details Pronounced proton core temperature anisotropy, ion differential speed, and simultaneous Alfven wave activity in slow solar wind at 0.3 AU Pronounced proton core temperature anisotropy, ion differential speed, and simultaneous Alfven wave activity in slow solar wind at 0.3 AU

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.9199m&link_type=abstract

Journal of Geophysical Research, vol. 86, Oct. 1, 1981, p. 9199-9203. Bundesministerium für Forschung und Technologie

Physics

39

Ion Temperature, Magnetohydrodynamic Waves, Proton Energy, Solar Activity Effects, Solar Protons, Solar Wind Velocity, Anisotropy, Helios Satellites, Helium Ions, Hydrogen Ions, Interplanetary Space, Ion Distribution, Plasma Diagnostics, Satellite Observation, Velocity Distribution

Scientific paper

Observations of slow solar wind ion distributions characterized by the pronounced differential speeds and temperatures between hydrogen and helium ions and the Alfven wave activity previously found only in high-speed streams are reported. Ion velocity distributions were measured in three dimensions by the quadrispheric electrostatic analyzer on board Helios 2 during perihelion at 0.3 AU in May, 1978, during which the average wind speed was between 300 and 400 km/sec. Ion differential speeds up to 100 km/sec and proton temperature anisotropies in the core of the distribution with a parallel/perpendicular temperature ratio of about 0.25 were found, accompanied by correlated bulk velocity and magnetic field vector fluctuations characteristic of transverse Alfven type waves. As Coulomb fraction between the two species can be shown to play a small role in establishing the velocity differential, it is suggested that preferentially accelerating wave forces may explain the observation. Pronounced wave activity at the coronal base may thus not always be sufficient to create a high-speed solar wind.

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