Physics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.5850h&link_type=abstract
Journal of Geophysical Research, vol. 84, Oct. 1, 1979, p. 5850-5862.
Physics
Advection, Gas Flow, Gas Ionization, Geomagnetism, Magnetic Effects, Neutral Gases, Ambipolar Diffusion, Electric Fields, Gravitational Effects, Inhomogeneity, Plasma Composition, Wind Effects
Scientific paper
A theory is developed for the ambipolar diffusion, drift, distortion, and production of ionization inhomogeneities within weakly ionized plasma in the presence of the geomagnetic field and motions of the neutral gas. The theory developed includes spatially varying velocity fields of the neutral gas, with a special emphasis on investigating the length scale restrictions necessary for the plasma to be treated as spatially homogeneous. Several effects of the magnetic field on ionization inhomogeneities are discussed. These include the anisotropy of ambipolar diffusion, the distortion and drift due to a gravitational field, the production of irregularities due to the turbulent acceleration field, the drift relative to the neutral gas, and the distortion of ionization inhomogeneities due to the effects of a uniform wind. Pertinent equations are derived for a multispecies plasma containing positive or negative ions, and for the case of electrons and one species of positive ions.
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