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Neutral Temperature of Cometary Atmospheres

Published online by Cambridge University Press:  12 April 2016

Mikio Shimizu

Extract

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The spectral analysis of the coma and type I tails of a comet gives a clue to clarify the composition of the volatiles in its nucleus. The ultraviolet observation of strong H, O, and OH emissions in comets 1969 g and i by OAO II (Code and Savage, 1972) and the recent identification of H2O+ in the spectrum of 1973f (Wehinger et al., 1974) have suggested that the main constituent of cometary coma is H.O. It was also suggested from the computation of the ionization processes (Jackson and Donn, 1968) that CO and N. may be the second most abundant gases (some ten% by number) in comets. Other gases detected in the optical (C2, CN, C3…), ultraviolet (NH, CN) and radio (CH, CHg, CN) regions appears to be minor constituents of cometary atmospheres.

Type
Part II
Information
International Astronomical Union Colloquium , Volume 25 , Issue Part2: The Study of Comets , 1976 , pp. 763 - 772
Copyright
Copyright © NASA 1976

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