The 63 micron radiation field in the earth's thermosphere and its influence on the atomic hydrogen temperature

Details The 63 micron radiation field in the earth's thermosphere and its influence on the atomic hydrogen temperature The 63 micron radiation field in the earth's thermosphere and its influence on the atomic hydrogen temperature

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27..795d&link_type=abstract

Planetary and Space Science, vol. 27, June 1979, p. 795-800. NSF-supported research;

Physics

2

Cooling, Gas Temperature, Hydrogen Atoms, Infrared Radiation, Thermosphere, Atomic Collisions, Night Sky, Oxygen Atoms, Thermodynamic Equilibrium, Vertical Distribution

Scientific paper

The thermal escape of hydrogen from the earth's atmosphere is strongly affected by its temperature at the exobase. It has been suggested recently that the hydrogen temperature might be significantly lower than the thermospheric temperature as a result of a collisional exchange of energy with atomic oxygen. The tendency is to cool the hydrogen since the energy of the excited 3P1 level of oxygen can be lost from the atmosphere via magnetic dipole emission of the micron line (3P2-3P1). A detailed calculation of the net cooling effect as a function of altitude throughout the thermosphere is presented. The calculations have been performed for both day and night conditions and for periods of maximum and minimum solar activity conditions. It is found that its effect on Delta T/T varies from a very small value to a maximum of about 3%. The theoretical framework for describing deviations of the 63 micron emission from local thermodynamic equilibrium is given and it is shown that these effects can cause the emission to be reduced by as much as 40% near 500 km.

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