- Status Report
- Dec 3, 2022
NASA Mars Odyssey THEMIS Image: Wind Streaks
Context image credit: NASA/Mars Orbiter Laser Altimeter (MOLA) Team
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Full data on this image has now been released via the THEMIS Data Releases website.
The atmosphere of Mars is a dynamic system. Water-ice clouds, fog, and hazes can make imaging the surface from space difficult. Dust storms can grow from local disturbances to global sizes, through which imaging is impossible. Seasonal temperature changes are the usual drivers in cloud and dust storm development and growth.
Eons of atmospheric dust storm activity has left its mark on the surface of Mars. Dust carried aloft by the wind has settled out on every available surface; sand dunes have been created and moved by centuries of wind; and the effect of continual sand-blasting has modified many regions of Mars, creating yardangs and other unusual surface forms.
Windstreaks are features caused by the interaction of
wind and topographic landforms. The raised rims and bowls of
impact craters causes a complex interaction such that the
wind vortex in the lee of the crater can both scour away the
surface dust and deposit it back in the center of the lee.
If you look closely, you will see evidence of this in a
darker “rim” enclosing a brighter interior.
[Source: ASU THEMIS Science Team]
Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.
Image Credit: NASA/JPL/Arizona State University
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