Abstract
The temperature distributions in cometary atmospheres at various heliocentric distances for comets of Bennett and Encke types have been calculated by taking into account heating due to the absorption of solar ultraviolet radiation, cooling by H20 far infrared emission, and various dynamical processes (expansion, advection, and thermal conduction). The agreement of the results with the observations is in general satisfactory. The conversion of CH4 and NH, to CO and N2 through thermochemical reaction with H20 is concluded to be impossible, since the temperature is too low at a heliocentric distance 1.5 AU where CO + ions begin to be observable.
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