Physics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985angeo...3..145v&link_type=abstract
Annales Geophysicae (ISSN 0755-0685), vol. 3, Mar.-Apr. 1985, p. 145-155.
Physics
Auroral Arcs, Electron Beams, Plasma Turbulence, Space Plasmas, E Region, Electron Energy, F Region, Ionospheric Electron Density, Plasma Oscillations, Plasma Waves
Scientific paper
The question concerning the stability of auroral electron beams is considered on the basis of the available measurements both of the beams and of ionospheric plasma. It is shown that in the ionospheric F-region where omega(pe) is greater than or approximately equal to omega(ce) is valid, the mentioned beams are only unstable against Langmuir oscillations. It is demonstrated that using the regime of strong turbulence cannot resolve the problem of stabilization of unstable electron beams. It is further shown that a regular-height inhomogeneity of the ionospheric plasma insures stabilization of the mentioned unstable beams. The region of collective relaxation of the mentioned auroral electron beams is bounded by the F2 peak, at which the density gradients are small and have a height scale of about 10 km. It is shown that collective heating is able to ensure high-electron temperatures of about 0.6 eV, a fact that is occasionally observed in discrete auroral arcs at heights of the F2 peak.
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