Other
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..635b&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, May 1984, p. 635-640.
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1
Coulomb Collisions, Equatorial Atmosphere, F Region, Ionospheric Disturbances, Magnetohydrodynamic Stability, Space Plasmas, Collisional Plasmas, Electron Scattering, Electrostatics, Ionic Collisions, Modal Response
Scientific paper
The effect of collisions on electrostatic instabilities driven by gravity and density gradients perpendicular to the ambient magnetic field is studied. Electron collisions tend to stabilize the short wavelength (the product of the perpendicular wavenumber of the instability and ion Larmor radius being much greater than 1) kinetic interchange mode. In the presence os weak ion-ion collisions, this mode gets converted into an unmagnetized ion interchange mode which has maximum growth rate one order smaller than that of the collisionless mode. On the other hand, electron collisions can excite a long wavelength resistive interchange mode in a wide wavenumber regime (the product of the perpendicular wavenumber of the instability and the ion Larmor radius ranging from 0.001 to approximately 0.3) with growth rates comparable to that of the collisional Rayleigh-Taylor mode. The results may be relevant to some of the spread F irregularities.
Bhattacharyya Arnab
Lakhina Gurbax S.
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