Computations of local ion energy balance in the auroral zone

Details Computations of local ion energy balance in the auroral zone Computations of local ion energy balance in the auroral zone

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9815667s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A9, p. 15,667-15,676.

Physics

3

Auroras, Electron Energy, Ion Temperature, Ionospheric Electron Density, Ionospheric Heating, Heat Flux, Ionospheric Drift, Thermosphere, Wind (Meteorology)

Scientific paper

An investigation of the coupling between the ionosphere and the thermosphere is made using coordinated measurements obtained simultaneously with the Chatanika incoherent-scatter radar and two Fabry-Perot spectrometers at College, Alaska, during a 2 hr period in February 1982. Interpreting these measurements using the ion energy equation for the F region yields the height(s) at which heat exchange between the ions and neutrals balances the sum of frictional heating due to differences in the ion and neutral velocities and heat exchange between the electrons and ions. This height can be interpreted as the location of the oxygen 630.0 nm emission profile centroid, thus providing an estimate of the height of the neutral temperature measurement. Furthermore, the centroid location and extent in altitude depend on the processes producing O(1D) in aurorae. A unique balance height was not typically found, but balance often occurred over a wide range of altitudes, depending on the assumption of a pure O(+) or a pure NO(+) ionosphere, which is consistent with model calculations of the 630.0 nm emission rate profile.

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