The mechanism responsible for cooling the dayside thermosphere of Venus from about 700 K to 300 K (Noll and McElroy, 1972) is examined by analyzing in situ measurements made by the Pioneer Venus Orbiter of the weak response of the thermosphere to short-term solar variations related to 27-day solar rotation. It is shown that, in order to cool the Venus dayside thermosphere to observed levels and to simultaneously explain the weak 27-day variations in the atmosphere, it is necessary to invoke strong CO2 cooling which is controlled principally by collisions of CO2 with atomic oxygen.


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    Title :

    Venus thermospheric response to short-term solar variations


    Contributors:

    Published in:

    Publication date :

    1992-09-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




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