PIA00047: Neptune - Changes in Great Dark Spot
 Target Name:  Neptune
 Is a satellite of:  Sol (our sun)
 Mission:  Voyager
 Spacecraft:  Voyager 2
 Product Size:  430 x 465 pixels (w x h)
 Produced By:  JPL
 Producer ID:  P34622
 Addition Date:  1996-01-29
 Primary Data Set:  Voyager EDRs
 Full-Res TIFF:  PIA00047.tif (111.3 kB)
 Full-Res JPEG:  PIA00047.jpg (25.64 kB)

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The bright cirrus-like clouds of Neptune change rapidly, often forming and dissipating over periods of several to tens of hours. In this sequence spanning two rotations of Neptune (about 36 hours) Voyager 2 observed cloud evolution in the region around the Great Dark Spot (GDS) at an effective resolution of about 100 kilometers (62 miles) per pixel. The surprisingly rapid changes which occur over the 18 hours separating each panel shows that in this region Neptune's weather is perhaps as dynamic and variable as that of the Earth. However, the scale is immense by our standards the Earth and the GDS are of similar size and in Neptune's frigid atmosphere, where temperatures are as low as 55 degrees Kelvin (360 F), the cirrus clouds are composed of frozen methane rather than Earth's crystals of water ice. The Voyager Mission is conducted by JPL for NASA's Office of Space Science and Applications.

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