Martian cloud formations sometimes look like those on Earth, but with dust at their core, not water by AndyTomaswick
One of the most distinct pictures from the HRSC images shows a spiral pattern that seemed very similar to a hurricane on Earth. They reach between 1000 and 2000 km in size and are thought to be caused by similar patterns to those that form hurricanes here.
Similarities between Earth and Martian clouds don’t stop there. Some of Earth’s more picturesque cloud formations involve a “texturing” pattern that makes them look like sand. A similar pattern happens on Mars, and “textured” clouds can be seen in some of the images Mars Express sent back. These textures are formed by a convection pattern where, on Earth, air containing water is heated by the Sun, causing it to rise, and eventually, the water condenses to form clouds. On Mars, however, water is not so readily available, so the Sun heats the dust-laden air, causing it to rise similarly and then fall into gaps between the pockets of hot air containing the dust. This overall “closed-cell convection” causes the textured pattern seen in the image.
Finding similar patterns elsewhere in the solar system is both comforting and enlightening. Using those similarities to help predict Martian weather, especially for future crewed missions, is one way that long-standing missions such as Mars Express can continue to help contribute to humanity’s long-term exploration of space.
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