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Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phdt.........5w&link_type=abstract
Ph.D. Thesis Arizona Univ., Tucson.
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1
Atmospheric Models, Jupiter (Planet), Lightning, Monte Carlo Method, Photography, Radiative Transfer, Satellite Imagery, Abundance, Clouds (Meteorology), Voyager 1 Spacecraft, Voyager 2 Spacecraft
Scientific paper
In 1979, Voyager I provided the first strong evidence for the existence of lightning on another planet. Two pictures taken while the spacecraft was in the shadow of Jupiter reveal about three dozen luminous spots on the night side of the planet. After careful examination of these spots, it was concluded that they are lightning flashes occurring somewhere within the atmosphere of Jupiter. A search through the additional Voyager I and II images of Jupiter's night hemisphere failed to locate any additional lightning flashes. Analysis of the lightning images reveals that the flashes group near 50 degrees N latitude. High resolution photographs of the lightning region made in daylight about 65 hours before the discovery images show long, light ribbon-like clouds. Almost every flash appears to be associated with one of these clouds. Calculations made with a Monte Carlo radiative transfer code that computes the luminosity distribution of the spot on the top of the ammonia cloud that is produced by a point source within the atmosphere indicate that the lightning production region is near the top of the lower cloud deck. Calculations made with a chemical equilibrium model show that lightning synthesis cannot account for the observed abundances of such disequilibrium species as CO, HCN, and C2H2.
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