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Richard D. Cadle


Photochemical processes which must occur in the upper atmosphere of Jupiter are discussed and the significance of recent data pertinent to such reactions is analyzed. These data include (a) the ultraviolet solar radiation flux, (b) velocity constants and activation energies for many of the reactions, (c) absorption coefficients for some of the atmospheric constituents, and (d) semi-quantitative values for concentrations of major atmospheric constituents.

A rough calculation of the influence of photochemical reactions on the atmospheric composition is described. The results suggest that molecular hydrogen undergoes a slow photolysis to a considerable depth in the atmosphere thus maintaining the high concentrations of methane and ammonia.

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Richard D. Cadle, Gerhard Langer, J. B. Haberl, A. Hogan, James M. Rosen, William A. Sedlacek, and J. Wegrzyn


Laboratory comparisons have been made of aerosol concentrations indicated by four different types of condensation nucleus counters. Three of these counters, the Langer, Rosen, and General Electric SANDS instruments have been used to measure Aitken nuclei concentrations in the upper troposphere and the stratosphere, and the fourth, a Pollak counter, had been carefully calibrated to serve as a standard. Except for the smallest particles employed, quite good agreement was experienced among the Rosen, SANDS and Pollak counters, and the tests served to calibrate the Langer instrument.

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