Observations of the velocity distribution of solar wind ions

Details Observations of the velocity distribution of solar wind ions Observations of the velocity distribution of solar wind ions

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.6069o&link_type=abstract

Journal of Geophysical Research, vol. 85, Nov. 1, 1980, p. 6069-6074. Research supported by the Swiss National Science Foundati

Physics

20

Ion Distribution, Solar Wind Velocity, Velocity Distribution, Helium Ions, Oxygen Ions

Scientific paper

Measurements made by the Isee 3 ion composition experiment have been used to determine the kinetic temperatures of 3He(++), 4He(++), 16O(6+), and 16O(7+) in the solar wind. It is found that these temperatures generally obey the relation that T(i)/m(i) equals const, but fluctuations, some of which are caused by dynamical effects in the flow, are observed. The temperature of oxygen sometimes rises above 10 K, which is very strong evidence for heating outside the collisional region of the corona. The tendency toward equal temperatures per nucleon occurs everywhere where collisions are unimportant, suggesting that the temperatures are set up close to the sun rather than elsewhere in the interplanetary medium. The velocity distribution function of helium is observed to be non-Maxwellian, with a pronounced high velocity tail.

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