Newly released ESA image showing the emergence of the plume on Arsia Mons!
I had already shown an image from September 16 in which the plume was absent, but the first subsequent image taken by the Mars Webcam in which the plume appeared was from September 19. Now instead, thanks to this image, we can date the beginning of the phenomenon to September 17, 2018.
This image was taken by the OMEGA visible light and near infrared spectrometer on board the Mars Express from an altitude of 11000 km.
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