Statistics – Applications
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.4119c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, May 1, 1983, p. 4119-4121. Research supported by the U.S. Defense Nuc
Statistics
Applications
3
Auroral Zones, Convective Flow, Electron Beams, Magnetohydrodynamic Stability, Space Plasmas, Cold Plasmas, Field Aligned Currents, Ionospheric Disturbances, Linear Equations, Plasma Density
Scientific paper
It has been found that the current-convective instability plays a role in the generation of scintillation-causing, large-scaled plasma irregularities in the diffuse aurora. This instability is caused by a field-aligned current in the presence of a transverse plasma-density gradient in a collisional plasma. A significant part of the observed field-aligned current is carried by the cold ionospheric electron component, drifting relative to ions. A precipitating flux of soft energetic electrons also is present alongside the cold drifting electrons in the medium. In the study conducting by Ossakow and Chaturvedi (1979), only the cold electron-drift was considered. In the present investigation, the effects of the presence of an electron beam on the low-frequency current-convective instability are considered. It is found that, although the presence of an electron beam modifies the growth rate of the current-convective instability, such effects are practically negligible in the diffuse auroral applications.
Chaturvedi P. K.
Ossakow S. L.
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