Physics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983angeo...1..259s&link_type=abstract
Annales Geophysicae (ISSN 0755-0685), vol. 1, May-June 1983, p. 259-264.
Physics
4
E Region, Ionospheric Drift, Magnetohydrodynamic Stability, Space Plasmas, Electron Density Profiles, Kinetic Theory
Scientific paper
The characteristics of small wavelength gradient drift waves are investigated for application to auroral E-region irregularity studies. It is shown that small wavelength gradient-drift waves differ from gradient free Farley-Buneman waves. Weak gradients widen the range over which waves are destabilized, while it is determined that strong gradients enhance the growth rate of decimeter size instabilities. The effect of gradients is found also to increase the growth rates of waves with null wave vector components in the magnetic field direction. The effect of the electron temperature, the electron density, and the collision frequencies on the growth of unstable waves is examined. A fluid dispersion relation is derived from the more general kinetic theory, and it is shown how this more general fluid dispersion relation, which is valid for intermediate to long wavelengths, differs from the long wavelength dispersion relation often used by investigators.
Jean-Pierre St.-Maurice
Schlegel Kristian
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