domingo, 23 de agosto de 2020

APOD: 2020 August 11 - Churning Clouds on Jupiter

APOD: 2020 August 11 - Churning Clouds on Jupiter

Churning Clouds on Jupiter
Image Credit & LicenseNASA/JPL-Caltech/SwRI/MSSSProcessing: Kevin M. Gill

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Explanation: Where is Jupiter's ammonia? Gaseous ammonia was expected to be seen in Jupiter's upper atmosphere by the orbiting Juno spacecraft -- but in many clouds is almost absent. Recent Juno data, however, gives some clues: some high-level clouds appear to be home to an unexpected type of electrical discharge dubbed shallow lightning. Great charge separations are needed for lightning, which might be created by colliding mushballs lifted by rising updrafts of gas. Ammonia and water stick to these mushballs which rise until they get too heavy -- after which they fall deep into Jupiter's atmosphere and melt. By this process, ammonia found missing from Jupiter's upper atmosphere reappears below. Pictured by Juno, churning clouds on Jupiter show not only mesmerizing complexity but some high-level, light-colored pop-up cloudsUnderstanding atmospheric dynamics on Jupiter gives valuable perspective to similar atmospheric and lightning phenomena that occur on our home Earth.

See Explanation.  Clicking on the picture will download
the highest resolution version available.

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