Anomalous acceleration of minor ions in the solar wind

Details Anomalous acceleration of minor ions in the solar wind Anomalous acceleration of minor ions in the solar wind

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.274..350m&link_type=abstract

Nature, vol. 274, July 27, 1978, p. 350, 351.

Physics

3

Helium Ions, Ionic Collisions, Magnetohydrodynamic Waves, Plasma Acceleration, Plasma-Particle Interactions, Solar Protons, Solar Wind Velocity, Acceleration, Coulomb Collisions, Solar Magnetic Field, Wave Equations

Scientific paper

It has been found that the bulk speed of helium ions in solar wind plasma exceeds that of the protons, provided conditions are such that Coulomb collisions are ineffective in coupling the two species together. A description is presented of a mechanism which could produce this unexpected effect for any minor ion species, based on the assumption that the sun is a copious emitter of Alfven waves, as is indeed observed. The obtained result is in good qualitative agreement with the findings of Neugebauer (1976) to the effect that the differential flow speed between helium ions and protons in the solar wind is controlled by the parameter 'eta', as is the temperature difference. The parameter 'eta' considered is the ratio of the solar wind expansion time to the ion-proton collision time.

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