Diffusion and thermal diffusion in partially ionized gases in the atmospheres of the sun and planets

Details Diffusion and thermal diffusion in partially ionized gases in the atmospheres of the sun and planets Diffusion and thermal diffusion in partially ionized gases in the atmospheres of the sun and planets

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...159....1g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 159, no. 1-2, April 1986, p. 1-15. SNSF-supported research.

Astronomy and Astrophysics

Astrophysics

38

Atomic Collisions, Ionic Diffusion, Ionized Gases, Planetary Atmospheres, Solar Atmosphere, Thermal Diffusion, Chromosphere, Diffusion Coefficient, Momentum Transfer, Planetary Ionospheres, Plasmasphere, Recombination Reactions, Stellar Atmospheres

Scientific paper

The collision terms of the momentum equations for the components of a partially ionized gas including the effects of ionization, recombination, and charge exchange are investigated. The drag and thermal diffusion coefficients are derived for a gas consisting of electrons, one atomic and one ionic species as major components and charged or neutral minor constituents for the case of equal temperatures of atoms and ions. Enhanced thermal diffusion, where the major components are atoms and singly charged ions of the same kind, is due to the relative large resonant charge exchange (RCE) ion-atom cross section and the strong effective momentum transfer in RCE encounters. The results are discussed in regard to solar and stellar surface processes. Thermal diffusion is shown to be weak for atoms and strong for ions. The dependence of the thermal diffusion coefficients of ions on the degree of hydrogen ionization could promote the separation of elements with low first ionization potential from those with high first ionization potential in the atmospheres of the sun and stars.

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