NASA Mars Orbiter Catches Twister in Action

 An afternoon whirlwind on Mars lofts a twisting column of dust more than half a mile (800 meters) high in an image from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter


arizona. Dust devils occur on Earth as well as on Mars. gov/mro edu. This mission has returned more data about Mars than all other orbital and surface missions combined. The active dust devil displays a delicate arc produced by a westerly breeze partway up its height. HiRISE captured the image on Feb. Exposure to the sun's rays declines during this season, yet even now, dust devils act relentlessly to clean the surface of freshly deposited dust, a little at a time. HiRISE is operated by the University of Arizona, Tucson. For more about the Mars Reconnaissance Orbiter, see www. JPL is a division of the California Institute of Technology, also in Pasadena. The Mars Reconnaissance Orbiter has been examining Mars with six science instruments since 2006. Unlike a tornado, a dust devil typically forms on a clear day when the ground is heated by the sun, warming the air just above the ground. Just as on Earth, winds on Mars are powered by solar heating. nasa. The image was taken during the time of Martian year when that planet is farthest from the sun. Now in an extended mission, the orbiter continues to provide insights into the planet's ancient environments and how processes such as wind, meteorite impacts and seasonal frosts continue to affect the Martian surface today. In the area observed, paths of many previous whirlwinds, or dust devils, are visible as streaks on the dusty surface. As heated air near the surface rises quickly through a small pocket of cooler air above it, the air may begin to rotate, if conditions are just right. More than 21,700 images taken by HiRISE are available for viewing on the instrument team's website: http://hirise. lpl. , for NASA's Science Mission Directorate, Washington. They are spinning columns of air, made visible by the dust they pull off the ground. The Mars Reconnaissance Orbiter Project and the Mars Exploration Rover Project are managed by the Jet Propulsion Laboratory, Pasadena, Calif. The instrument was built by Ball Aerospace & Technologies Corp. The dust plume is about 30 yards or meters in diameter. 16, 2012, while the orbiter passed over the Amazonis Planitia region of northern Mars. Each observation by this telescopic camera covers several square miles, or square kilometers, and can reveal features as small as a desk. Lockheed Martin Space Systems, Denver, built the orbiter. , Boulder, Colo.