Physics
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....9011062h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Nov. 1, 1985, p. 11,062-11,066.
Physics
15
Collision Rates, Coulomb Collisions, Energy Transfer, Maxwell-Boltzmann Density Function, Momentum Transfer, Plasma Heating, Plasma Drift, Plasma Dynamics, Plasma Temperature
Scientific paper
The Coulomb collision transfer rates for energy and momentum exchange between drifting Maxwellians are evaluated. The associated time scales which depend on the masses, densities, temperatures, and velocities of the two colliding species are discussed. Inclusion of finite mass density effects of the minor species generally leads to shorter time scales, as compared to the test particle approach, for any differential speed and temperature equalization. It is found that two particle species may, by collisions, attain a temperature ratio which can range between 1 (thermodynamic equilibrium) and the inverse ratio of their mass densities. This result suggests the possibility of preferentially heating the species with the lower mass density by Coulomb collisions, assuming that their differential speed can be externally maintained against frictional deceleration.
Hernández Rodrigo
Marsch Eckart
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