NASAのインスタグラム(nasa) - 9月17日 02時50分

On its 15th close flyby of Jupiter, our @NASAJuno spacecraft spotted a long, brown oval known as a "brown barge" in the South Equatorial Belt.
Brown barges are cyclonic regions that usually lie within Jupiter's dark North Equatorial Belt, although they are sometimes found in the similarly dark South Equatorial Belt as well. They can often be difficult to detect visually because their color blends in with the dark surroundings.
At other times, as with this color-enhanced image, the dark belt material recedes, creating a lighter-colored background against which the brown barge is more conspicuous.
Brown barges usually dissipate after the entire cloud belt undergoes an upheaval and reorganizes itself. Juno is giving us the first glimpses of the detailed structure within such a barge.
Since 2016, Juno has been penetrating Jupiter’s deep, colorful zones and belts in a quest to answer fundamental questions about the gas giant planet's origin and evolution.
Credit: NASA/JPL-Caltech/SwRI/MSSS/Kevin M. Gill
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