Electromagnetic theory of collisional interchange instabilities

Details Electromagnetic theory of collisional interchange instabilities Electromagnetic theory of collisional interchange instabilities

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....8810091g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Dec. 1, 1983, p. 10091-10103. Research supported by the U.S. Defense

Physics

5

Atmospheric Electricity, Electric Fields, Electromagnetic Interactions, Ionospheric Disturbances, Space Plasmas, Barium Ion Clouds, Collisional Plasmas, Ionospheric Currents, Plasma Density, Spread F

Scientific paper

Finite parallel wavelength is shown to have a significant effect on the linear growth of instabilities of the Rayleigh-Taylor or E x B gradient drift types. The flute approximation, which explicitly neglects electric fields parallel to the ambient magnetic field, is asymptotically correct for long perpendicular wavelengths, if the parallel component of the electric field is primarily inductive in character. However, when the parallel electric field is primarily electrostatic, there is a profound reduction in the growth rate for long perpendicular wavelengths. This reduction in growth rate arises because parallel electron currents short-circuit the perpendicular electric field driving the instability. Parallel electric fields are more likely to be electrostatic in lower-density plasmas than in higher-density plasmas. Consequently, the extrapolation of structuring from low-density plasmas, such as those found in the spread-F environment, to higher-density ionospheric plasmas may not be reasonable.

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