Thermospheric heating under proton precipitation

Details Thermospheric heating under proton precipitation Thermospheric heating under proton precipitation

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.5845s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, June 1, 1988, p. 5845-5854.

Other

2

Atmospheric Models, Ionospheric Heating, Maxwell-Boltzmann Density Function, Proton Precipitation, Thermodynamic Efficiency, Thermosphere, Earth Magnetosphere, Elastic Scattering, Exothermic Reactions, Gas Dissociation, Ion Production Rates, Plasma Heating, Power Spectra

Scientific paper

Model calculations of the interaction of energetic protons with the thermosphere are performed to evaluate the heating efficiency. All energy channels which are responsible for the neutral gas heating are taken into account. The heating efficiency is evaluated for the Maxwellian and power law spectra of precipitating protons. It is shown that the altitude profile of heating efficiency is dependent on the proton spectrum. For a Maxwellian distribution with the characteristic energy alpha = 50 keV about 65 percent of the total energy input goes into heating, whereas for alpha = 2 keV only about 55 percent of the energy input goes into heating at the altitude where the energy deposition is maximum. For the power law spectrum, the variation of heating efficiency with altitude is found to be quite different from that of Maxwellian distribution. The maximum value of heating efficiency is found to be 0.68 for the PCA event of March 21, 1969, which is considered in the model calculations for power law spectrum.

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