Plasma, fluid instabilities in ionospheric holes

Details Plasma, fluid instabilities in ionospheric holes Plasma, fluid instabilities in ionospheric holes

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.7539b&link_type=abstract

Journal of Geophysical Research, vol. 87, Sept. 1, 1982, p. 7539-7549. Research supported by the U.S. Department of Energy.

Physics

4

Atmospheric Chemistry, Ionospheric Disturbances, Magnetohydrodynamic Stability, Space Plasmas, Convective Flow, F Region, Molecular Ions, Oxygen Ions, Positive Ions, Taylor Instability

Scientific paper

Instabilities can be both triggered and quenched by chemical releases which generate ionospheric holes. Vapors, such as H2O, H2, and CO2, rapidly react with the O(+) ions in the upper atmosphere, producing polyatomic ions such as H2O(+) ions in the upper atmosphere, producing polyatomic ions such as H2O(+), H3O(+), OH(+) and O2(+). These ions quickly combine with electrons, leaving neutral species. The enhanced F region neutralization initially tends to quench the fluid instabilities in the modified region. After the injected vapors dissipate, chemical quenching becomes unimportant. At late times, the sides of the ionospheric hole may become unstable to fluid instabilities. The wind-driven gradient-drift instability, the current-convective instability, and the gravitational Rayleigh-Taylor instability are three classes of instabilities which may produce irregularities in ionospheric holes. These instabilities are investigated by using local, linear perturbation analysis. The removal of preexisting plasma irregularities by reactive chemical releases is also investigated.

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