Mars Dust Devil Has Colorful Effect in Image Series

the panoramic camera (Pancam) on NASA's Mars Exploration Rover Spirit was taking exposures with different color filters during the 1,919th Martian day While the panoramic camera (Pancam) on NASA's Mars Exploration Rover Spirit was taking exposures with different color filters during the 1,919th Martian day of the rover's mission (May 27, 2009), dust devils moved across the field of view.
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July 14, 2009

Scientists have combined a trio of shots taken seconds apart through different colored filters to create a special-effects portrait of a moving dust devil on Mars.

The panoramic camera on NASA's Mars Exploration Rover Spirit was taking exposures through different filters during the 1,919th Martian day of Spirit's mission (May 27, 2009) as part of constructing a large color panorama. Three westward shots, with several seconds intervening between them, caught a whirlwind in motion. A composite image combining the three exposures to make a color image of the Martian ground shows the dust devil in different colors, according to where it was on the horizon when each exposure was taken.

Dust devils occur on both Mars and on Earth when solar energy heats the surface, resulting in a layer of warm air just above the surface. Since the warmed air is less dense than the cooler atmosphere above it, it rises, making a swirling thermal plume that picks up the fine dust from the surface and carries it up into the atmosphere. This plume of dust moves with the local wind.

More than 650 dust devils have been recorded by Spirit since its operations began in 2004. The mission is currently in its third season of dust devils on Mars, which typically begin in Martian spring.

Images

The navigation camera on NASA's Mars Exploration Rover Spirit caught this stereo view of a dust devil during the 1,913th Martian day

The navigation camera on NASA's Mars Exploration Rover Spirit caught this stereo view of a dust devil during the 1,913th Martian day, or sol, of the rover's mission on Mars (May 21, 2009).
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Researchers used the navigation camera on NASA's Mars Exploration Rover Spirit to look for dust devils near the rover during the mission's 1,919th Martian day

Researchers used the navigation camera on NASA's Mars Exploration Rover Spirit to look for dust devils near the rover during the mission's 1,919th Martian day, or sol (May 27, 2009).
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