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Dust Devils Spotted on Mars.


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Mars.
Dust Devils Spotted on Mars.

Still rolling along across the surface of Mars, NASA's Spirit rover recently spotted a dust devil whirling across the Martian landscape. Spirit first turned up dust devils on Mars mainly by accident a few months ago, but controllers have refined their strategy to use the rover's navigation camera to regularly take a series of photos in the hopes of catching one in action. By watching them blow past, controllers can get an idea of local wind patterns.

NASA's Mars Exploration Rover Spirit is taking movies of dust devils - whirlwinds carrying dust - scooting across a plain on Mars.

Clips consisting of a few frames of two different dust devils are available online at http://www.nasa.gov/vision/universe/solarsystem/mer_main.html and http://marsrovers.jpl.nasa.gov. These were taken on April 15 and April 18, and capture more movement as seen from the surface than any previous imaging of martian dust devils.

"This is the best look we've ever gotten of the wind effects on the martian surface as they are happening," said Dr. Mark Lemmon, a rover team member and atmospheric scientist at Texas A&M University, College Station.

Spirit, operated from NASA's Jet Propulsion Laboratory in Pasadena, Calif., has been using its navigation camera to routinely check for dust devils. It began seeing dust devils last month in individual frames from the camera. Lemmon said, "We're hoping to learn about how dust is kicked up into the atmosphere and how the wind is interacting with the surface. It's exciting that we now have a systematic way of capturing dust devils in movies rather than isolated still images."

Spirit and its twin, Opportunity, successfully completed three-month primary missions in April, 2004, and have been exploring at increasing distances from their landing sites since then.

JPL, a division of the California Institute of Technology in Pasadena, manages NASA's Mars Exploration Rover project for NASA's Science Mission Directorate, Washington.




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