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North pole hexagonal cloud pattern

North pole hexagonal cloud pattern - Great Red Spot of...

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North pole hexagonal cloud pattern North polar hexagonal cloud feature, discovered by Voyager 1 and confirmed in 2006 by Cassini . A persisting hexagonal wave pattern around the north polar vortex in the atmosphere at about 78°N was first noted in the Voyager images. [48] [49] Unlike the north pole, HST imaging of the south polar region indicates the presence of a jet stream , but no strong polar vortex nor any hexagonal standing wave. [50] NASA reported in November 2006 that Cassini had observed a " hurricane -like" storm locked to the south pole that had a clearly defined eyewall . [51] [52] This observation is particularly notable because eyewall clouds had not previously been seen on any planet other than Earth. For example, images from the Galileo spacecraft did not show an eyewall in the
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Unformatted text preview: Great Red Spot of Jupiter. [53] The straight sides of the northern polar hexagon are each approximately 13,800 km (8,600 mi) long, making them larger than the diameter of the Earth. [54] The entire structure rotates with a period of 10h 39m 24s, the same period as that of the planet's radio emissions, which is assumed to be equal to the period of rotation of Saturn's interior. [55] The hexagonal feature does not shift in longitude like the other clouds in the visible atmosphere. [56] The pattern's origin is a matter of much speculation. Most astronomers believe it was caused by some standing-wave pattern in the atmosphere; but the hexagon might be a novel aurora. Polygonal shapes have been replicated in spinning buckets of fluid in a laboratory....
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