Newly released ESA image capturing the plume over Arsia Mons on September 21, 2018.
Compare this image to the one shown by Dr Tanya Harrison and you decide if this is an orographic cloud or not (see https://www.facebook.com/PianetaMarte.MdM/photos/a.1625578140858706/1916650465084804/).
The mystery thickens and even though ESA insists on calling it an orographic cloud of water ice my personal reluctance to accept this view is increasingly motivated. In this image the “cloud” measures at least 915 km in length, but as already seen in the images of the Mars Webcam its length has reached 2100 km!
Note also the shadow cast on the ground by the “cloud” itself….
This image was taken from an altitude of 6930 km by the High Resolution Stereo Camera on board the Mars Express.
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