Dust Devil Tracks
Many areas on Mars, including Eridania, experience the passage of giant dust devils. A thin coating of fine bright dust covers most of the Martian surface. When a dust devil goes by it blows away the coating and exposes the underlying dark surface.
Dust devils occur when the sun warms up the air near a flat, dry surface. The warm air then rises quickly through the cooler air and begins spinning while moving ahead. This spinning, moving cell may pick up dust and sand then leave behind a clean surface.
Dust devils have been seen from the ground and high overhead from orbit. They have even blown the dust off of the solar panels of the two Rovers on Mars, thereby greatly extending their lives. The twin Rovers were designed to last for 3 months, instead they lasted more than six years, and one is still going after 8 years. The pattern of the tracks have been shown to change every few months.
A study that combined data from the High Resolution Stereo Camera (HRSC) and the Mars Orbiter Camera (MOC) found that some large dust devils on Mars have a diameter of 700 meters and last at least 26 minutes.
-
Kepler (Martian crater) showing dust devil tracks, as seen by Mars Global Surveyor.
-
Pattern of large and small tracks made by giant dust devils as seen by Mars Global Surveyor, under the MOC Public Targeting Program.
Read more about this topic: Eridania Quadrangle
Famous quotes containing the words dust, devil and/or tracks:
“Piles of scrapbooks, the cuttings turned by time to the colour of the freckles on an old lady’s hand. Her hand. My hand, as it is now. When you touch the old newsprint, it turns into brown dust, like the dust of bones.”
—Angela Carter (1940–1992)
“Will mankind never learn that policy is not morality,—that it never secures any moral right, but considers merely what is expedient? chooses the available candidate,—who is invariably the devil,—and what right have his constituents to be surprised, because the devil does not behave like an angel of light? What is wanted is men, not of policy, but of probity,—who recognize a higher law than the Constitution, or the decision of the majority.”
—Henry David Thoreau (1817–1862)
“The tracks of moose, more or less recent, to speak literally, covered every square rod on the sides of the mountain; and these animals are probably more numerous there now than ever before, being driven into this wilderness, from all sides, by the settlements.”
—Henry David Thoreau (1817–1862)