Temperatures of individual ion species and heating due to charge exchange in the ionosphere of Venus

Details Temperatures of individual ion species and heating due to charge exchange in the ionosphere of Venus Temperatures of individual ion species and heating due to charge exchange in the ionosphere of Venus

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.6569k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 6569-6573.

Physics

12

Charge Exchange, Ion Temperature, Planetary Ionospheres, Venus Atmosphere, Electron Energy, Extreme Ultraviolet Radiation, Planetary Magnetic Fields, Venus, Ionosphere, Temperature, Ions, Heating, Charge, Solar Cycles, Oxygen, Calculations, Magnetic Fields, Magnetic Effects, Parameters, Models, Electrons, Conductivity

Scientific paper

The coupled electron and multispecies ion energy equations were solved for daytime conditions in the Venus ionosphere. The heating rates due to charge exchange between hot oxygen atoms and thermal oxygen ions were calculated and incorporated into the energy equations. The combination of the traditional EUV heating and this hot oxygen energy source leads to calculated electron and individual ion temperatures significantly lower than the measured values during solar cycle maximum conditions. Calculations were also carried out for solar cycle minimum conditions, which led to considerably lower temperatures; no data are available which would allow direct comparisons of these results with measurements. In order to obtain calculated temperature values consistent with the observed ones, for solar cycle maximum conditions, topside heat inflows into the ion and electron gases have to be introduced or the thermal conductivity must be reduced by considering the effect of steady and fluctuating magnetic fields, as was done in previous studies. The addition of hot oxygen heating leads to minor increases in the calculated ion temperatures except for the case of reduced thermal conductivities. Separate temperatures were calculated for each ion species for a number of different conditions and in general the differences were found to be relatively small.

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