Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm...p51a06i&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #P51A-06 INVITED
Physics
3319 General Circulation, 3324 Lightning, 5445 Meteorology (3346), 5739 Meteorology (3346), 6220 Jupiter
Scientific paper
The Cassini and Galileo spacecraft have imaged Jupiter in narrow band filters that reveal the heights of the clouds and in broad band filters that reveal colored material within the clouds. The former filters cover strong and weak absorption bands of methane, allowing the observer to see high and low clouds, respectively. Galileo obtained a small number of images at high resolution (25 km per pixel), whereas Cassini obtained a large number of images (all faces of the planet every 20 hours for 70 days) at medium resolution (500 km to 60 km per pixel). Images of the dark side reveal lightning and auroras. The Cassini sequence is being made into a movie that reveals the life cycle of discrete features -- initial appearance, drifting, merging, orbiting, filamentation, and momentum transport. The lightning suggests that moist convection provides the energy of the small scale features, which give up their energy to the large scale features and the zonal jets by mergers and upscale energy transfer.
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