File:Arsia mons2.jpg

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Summary

DescriptionArsia mons2.jpg	Title : Arsia Mons Spiral Cloud Description : One of the benefits of the Mars Global Surveyor (MGS) Mars Orbiter Camera(MOC) Extended Mission is the opportunity to observe how the planet's weather changes during a second full martian year. This picture of Arsia Mons was taken June 19, 2001; southern spring equinox occurred the same day. Arsia Mons is a volcano nearly large enough to cover the state of New Mexico. On this particular day (the first day of Spring), the MOC wide angle cameras documented an unusual spiral-shaped cloud within the 110 km(68 mi) diameter caldera--the summit crater--of the giant volcano. Because the cloud is bright both in the red and blue images acquired by the wide angle cameras, it probably consisted mostly of fine dust grains. The cloud's spin may have been induced by winds off the inner slopes of the volcano's caldera walls resulting from the temperature differences between the walls and the caldera floor, or by a vortex as winds blew up and over the caldera. Similar spiral clouds were seen inside the caldera for several days; we don't know if this was a single cloud that persisted throughout that time or one that regenerated each afternoon. Sunlight illuminates this scene from the left/upper left.
Date	19 June 2001
Source	http://nix2.larc.nasa.gov/info?id=PIA03470
Author	NASA/JPL

This image or video was catalogued by Jet Propulsion Laboratory of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA03470 and Alternate ID: MOC2-302.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	04:13, 7 May 2006		838 × 838 (185 KB)	ComputerHotline	'''Title :''' Arsia Mons Spiral Cloud '''Description :''' One of the benefits of the Mars Global Surveyor (MGS) Mars Orbiter Camera(MOC) Extended Mission is the opportunity to observe how the planet's weather changes during a second full martian year. Th