Physics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9215083t&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Dec. 30, 1987, p. 15083-15092.
Physics
14
Atmospheric Chemistry, Auroras, Hydrocarbons, Hydrogen, Methane, Planetary Composition, Plasma Jets, Uranus Atmosphere, Atmospheric Composition, Experiment Design, Miranda, Ultraviolet Spectroscopy, Voyager 2 Spacecraft
Scientific paper
The production of light hydrocarbons by precipitating magnetospheric electrons in the Uranian stratosphere is simulated in laboratory experiments. The products of continuous-flow glow discharges of H2-He-CH4 mixtures containing 0.0012 or 0.022 mol pct CH4 at pressures 0.63-57 mbar are trapped at 77 K, measured manometrically, and identified by gas chromatography and mass spectroscopy; the results are presented in tables and characterized in detail. The globally averaged rate for the production of higher hydrocarbons by this mechanism on Uranus is estimated as 3 x 10 to the 6th C/sq cm sec and shown to be similar to that for photochemical production, while the local rate for the auroral zones is significantly higher than the corresponding photochemical rate. A decrease in yield with increasing molecular complexity is also noted.
Flynn Luke
Henry Todd
Khare Bishun N.
Reid Thompson W.
Schwartz Joel
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