On the energy deposition of photoelectrons in the atmosphere of Venus

Details On the energy deposition of photoelectrons in the atmosphere of Venus On the energy deposition of photoelectrons in the atmosphere of Venus

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.5196m&link_type=abstract

Journal of Geophysical Research, vol. 81, Oct. 1, 1976, p. 5196-5200.

Physics

4

Atmospheric Physics, Electron Flux Density, Ionospheric Heating, Photoelectrons, Venus Atmosphere, Boltzmann Transport Equation, Electron Energy, Electron Gas, Energy Transfer, Inelastic Collisions, Planetary Ionospheres, Scattering Cross Sections

Scientific paper

Vertical components of photoelectron fluxes in the atmosphere of Venus are computed by solving an appropriate form of the Boltzmann equation in the cases where there is no flux of either photoelectrons or solar-wind particles across the ionopause and where photoelectrons are free to escape from the atmosphere. It is assumed that Venus has no magnetic field and that the atmosphere is composed of carbon dioxide, atomic oxygen, and helium. The results are plotted as a function of altitude for several energies in the range from 100 eV to a cutoff of the order of 1 eV. Heating rates for the two upper boundary conditions and the case of no spatial transport are determined which show that transport effects dominate at altitudes greater than about 200 km. Electron temperatures are calculated for the adopted model atmosphere and ionosphere by solving the pertinent conservation equation, and excitation rates are computed for the CO Cameron band as well as the CO2(+) A and B bands.

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