Electron energy budget in the high-latitude ionosphere during Viking/EISCAT coordinated measurements

Details Electron energy budget in the high-latitude ionosphere during Viking/EISCAT coordinated measurements Electron energy budget in the high-latitude ionosphere during Viking/EISCAT coordinated measurements

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.6081l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 6081-6092.

Physics

7

Eiscat Radar System (Europe), Electron Energy, Ionospheric Electron Density, Magnetospheric Electron Density, Polar Regions, Viking Spacecraft, Boltzmann Transport Equation, Electron Precipitation, Energy Budgets, Space Plasmas, Temperature Gradients

Scientific paper

The magnetospheric electron fluxes precipitating at the top of the auroral ionosphere contribute to the production of ionization, to the excitation of atmospheric constituents, and to the heating of the ambient electrons. This last process occurs essentially when the energy of the initial precipitated electrons and photoelectrons has been degraded to values lower than approximately 10 eV. The heated ambient electron gas loses this energy to the neutral gas and ambient ions. Finally, the temperature gradient produced in the ionospheric plasma induces a heat flux. In the absence of an electric field and for stationary conditions, the energy budget of ionospheric electrons results from the balance between these processes of heating, cooling, and heat conduction. The intensity of these different processes is quantitatively computed at each altitude in the ionosphere by combining simultaneous EISCAT and Viking in situ measurements, and by means of an electron transport model. The stationary electron flux, which leads to the heating rate, is computed, and remaining differences in the energy budget are discussed.

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