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File:Mars-DustDevil-20170215.jpg

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English: PIA21457: A Dust Devil on Hilly Terrain

http://photojournal.jpl.nasa.gov/catalog/PIA21457

http://photojournal.jpl.nasa.gov/jpeg/PIA21457.jpg

http://photojournal.jpl.nasa.gov/figures/PIA21457_fig1.jpg

There are many dust devils on Mars -- little twisters that raise dust from the surface. They have also cleaned dust off of the solar panels of the rovers Opportunity and Spirit, improving the solar power production. (Spirit became stuck in 2009 and ceased communication a year later.)

HiRISE sees many dust-devil tracks on Mars, but rarely captures an active feature because the images cover such small areas and because the typical time of day near 3 p.m. is past the peak heating and dust-devil activity. In this 2008 image in the Amazonis region, we got lucky, although not lucky enough to capture the whole swirl in the color strip.

The map is projected here at a scale of 25 centimeters (9.8 inches) per pixel. [The original image scale is 29.5 centimeters (11.6 inches) per pixel (with 1 x 1 binning) to 58.9 centimeters (23.2 inches) per pixel (with 2 x 2 binning)]. North is up.

The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., Boulder, Colo. NASA's Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington.
日期 摄于2008年8月30日
来源 http://static.uahirise.org/images/2017/details/cut/PSP_009819_2130.jpg
作者 NASA/JPL-Caltech/Univ. of Arizona

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Public domain 本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zhNASA版权方针页面JPL图片使用方针。)
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