On the relationship between the population of the fine structure levels of the ground electronic state of atomic oxygen and the translational temperature

Details On the relationship between the population of the fine structure levels of the ground electronic state of atomic oxygen and the translational temperature On the relationship between the population of the fine structure levels of the ground electronic state of atomic oxygen and the translational temperature

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.1731s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 16, p. 1731-1734

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12

Atomic Collisions, Atomic Structure, Electron Emission, Electron Energy, Electron Transitions, Fine Structure, Local Thermodynamic Equilibrium, Oxygen Atoms, Reference Atmospheres, Thermosphere, Atmospheric Chemistry, Atmospheric Heat Budget, Electron Density (Concentration), Geomagnetism, Ground State, Scattering Cross Sections, Sunspots

Scientific paper

Using a recent calculation of the cross sections for fine structure changing collisions during an encounter between two oxygen atoms in the ground electronic state, we determine the population of the fine structure levels of oxygen as a function of altitude for four model atmospheres representing conditions at 0 deg longitude, 45 deg latitude, at midday and midnight, and high and low solar and geomagnetic activity. We include the effect of electron impacts. The fine structure levels are shown to be in local thermodynamic equilibrium (LTE) at the local neutral atom translational temperature for altitudes up to 350 km and 400 km for midnight and midday, respectively, at low activity, and up to at least 600 km at high activity. At higher altitudes spotaneous emission causes deviation from LTE and overpopulates the lowest (J = 2) level at the expense of the other two levels.

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