Physics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986em%26p...36..249m&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 36, Nov. 1986, p. 249-256. Research supported by the University of California.
Physics
12
Cometary Atmospheres, Halley'S Comet, Infrared Radiation, Radiative Heat Transfer, Molecular Collisions, Molecular Spectra, Temperature Distribution, Water Vapor
Scientific paper
The warm circumnuclear dust in the inner cometary coma reradiates in the IR in the wavelength range of the ground state rotational band of the dominant atmospheric molecule H2O. However, the interaction of this radiation with H2O has hitherto not been taken into account in cometary atmospheric models. Here, an earlier two-phase, multifluid model of the dusty atmosphere is extended by including this effect. Although this IR radiation initially pumps the rotational levels of H2O, frequent intermolecular collisions in the inner coma transfer this energy from rotational modes to translational modes. As a result the temperature in the innermost coma no longer decreases to about 10 K, as predicted by the earlier models, but reaches a minimum of only about 120 K.
Marconi Max L.
Mendis Asoka D.
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