Physics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..997e&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Feb. 1, 1984, p. 997-1002.
Physics
25
Ionopause, Venus Atmosphere, Kelvin-Helmholtz Instability, Magnetic Flux, Magnetohydrodynamic Stability, Planetary Ionospheres, Solar Planetary Interactions, Venus, Ionopause, Observations, Gravity Effects, Equations Of Motion, Plasmas, Magnetic Effects, Magnetic Fields, Flow, Analysis, Waves, Convection, Comparisons, Boundaries, Saturation, Electrodynamics, Turbulence, Parameters, Calculations, Time Scale
Scientific paper
The stability of the Venus ionopause is examined in light of the importance of gravitation and curvature. Using a one-fluid approximation for the equation of motion of the plasma, and ignoring the effects of neutrals, a dispersion relation is obtained that includes the effects of the magnetic field, sheared plasma flow, buoyancy, centrifugal force and magnetic tension due to boundary curvature. It is found that buoyancy acts to neutralize the flute instability. As expected, the Kelvin-Helmholtz mode is the dominant instability over most of the dayside ionopause. The expected growth times of this mode are short in comparison with the wave-convection time over the boundary; the waves can grow and saturate quickly, producing a turbulent boundary that may affect electrodynamic coupling between the solar wind and ionospheric plasmas.
Elphic Richard C.
Ershkovich A. I.
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