Acetylene formation on Jupiter - Photolysis or thunderstorms

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Acetylene, Atmospheric Chemistry, Jupiter Atmosphere, Photolysis, Thunderstorms, Astronomical Models, Atmospheric Models, Cloud Cover, Far Ultraviolet Radiation, Thermal Energy, Ultraviolet, Hypothesis, Methane, Hydrogen, Hydrocarbons, Models, Observations, Jupiter, Clouds, Ammonia, Acetylene, Photochemistry, Storms, Thunderstorms, Pressure, Temperatures, Irradiation, Experiments

Scientific paper

The far UV photolysis of methane, diluted 1000 times with hydrogen, was studied experimentally at 300 and 200 K. Acetylene was found to be formed along with other hydrocarbons. Two models are discussed in view of the experimental results. In the case of Orton and Aumann's (1977) model, in which the acetylene extends down only to the 15 mbar level, the agreement between the rates of acetylene production and destruction by photolysis is quite good. If Orton and Aumann's model is incorrect, and the acetylene extends down all the way to the ammonia clouds, an additional source of acetylene is required. Such a source might well be thunderstorms in the Jovian clouds. If thunderstorms do operate in the Jovian atmosphere, the conversion efficiency of thermal energy into lightning energy on Jupiter should be only 24 times larger than in the earth's tropics. This difference is similar to the difference by a factor of 20 between the earth's tropics and midlatitude regions.

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