Mars' orographic cloud

Mars Express keeps an eye on curious cloud

"In spite of its location, this atmospheric feature is not linked to volcanic activity but is rather a water ice cloud driven by the influence of the volcano's leeward slope on the air flow – something that scientists call an orographic or lee cloud – and a regular phenomenon in this region."
"The cloud's appearance varies throughout the martian day, growing in length during local morning downwind of the volcano , almost parallel to the equator, and reaching such an impressive size that could make it visible even to telescopes on Earth."

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