Comparison of the lower border of aurorae determined by two optical emission ratio models

Details Comparison of the lower border of aurorae determined by two optical emission ratio models Comparison of the lower border of aurorae determined by two optical emission ratio models

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37.1117r&link_type=abstract

Planetary and Space Science (ISSN 0032-0663), vol. 37, Sept. 1989, p. 1117-1123, 1125, 1126. Research supported by the Academy o

Physics

Optics

3

Atmospheric Optics, Auroras, Ionospheric Electron Density, Light Emission, Radar Measurement, Auroral Arcs, Eiscat Radar System (Europe), Electron Precipitation, Maxwell-Boltzmann Density Function

Scientific paper

Two models for the electron density profile calculations, assuming either a Maxwellian or a monoenergetic energy distribution for the precipitating auroral electrons, have been compared with electron density measurements by the EISCAT incoherent scatter radar. In both models, the column integrated emission ratio I(630.0)/I(427.8) is used to deduce the energy parameter for the precipitation, and the time-dependent electron density profiles are calculated using the continuity equation. The emission ratio models used in the Maxwellian and monoenergetic models are by Rees and Luckey (1974) and Vallance Jones (1975) respectively. The ionization rate profiles needed are calculated using the energy deposition functions by Rees (1963). In the case of two auroral arcs, the monoenergetic model is shown to give more reliable information about the lower border altitude of aurorae than the Maxwellian model. On the other hand, in the case of a discrete auroral patch, the electron spectrum is of a Maxwellian type, and the electron density profile deduced from the Maxwellian model fits the measured profile very well.

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