Collective heating and radiation dynamics of the auroral ionospheric F2-region

Details Collective heating and radiation dynamics of the auroral ionospheric F2-region Collective heating and radiation dynamics of the auroral ionospheric F2-region

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..995v&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, no. 7-8, July-Aug. 1992, p. 995-1005.

Physics

2

Auroras, Electron Beams, F 2 Region, Ionospheric Heating, Electron Energy, Plasma Density, Plasma Turbulence

Scientific paper

A numerical solution is derived for the dynamics of ionospheric F2-region collective heating and radiation induced by auroral electron beams that can be used to describe the auroral thermal wave. The generation of plasma waves by an auroral electron beam is discussed in terms of the influences of ion collisions, beam size, and plasmas irregularities. Hamiltonian equations for plasma waves and their growth rate are derived, and the conditions of plasma turbulence and the plasma-wave growth rate are determined. Nonlinear processes limit the level of plasma turbulence, and when the auroral beam is weakly unstable the plasma turbulence is not effectively limited by the modulational instability of the plasma waves. A numerical solution of the system of hydrodynamical equations is given for the ionospheric plasma with a collective heating source. Auroral decametric radiation (ADR) phenomena are shown to accompany the auroral thermal wave, and the calculated ADR frequency reductions agree with experimental values.

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