![]() ![]() Then there are these images where the sky darkens a lot when you get higher above from the horizon: It was taken over a period of 8 days which might mess things up a bit: ![]() Here is another one, this time from the pancam. In this one the brightness of the sky varies by a factor of more than three. There are many more similar examples, including images/mosaics from the pancam (this one is from the navcam). ![]() For example the brightness near the horizon can be highly variable: I still suspect the relative brightness of different parts of the sky varies a lot depending on atmospheric conditions and the sun's position in the sky. This has been largely a process of trial and error. For the dust I'm currently using Mie scattering only and have been experimenting with varying the amount of scattering, optical depth and adjusting a parameter similar to the Henyey-Greenstein asymmetry parameter. Seems I might end up using a more sophisticated atmospheric model than I'm currently using. Thanks - the paper mentioned by Mark Lemmon turned out to be extremely useful. I'm already getting fairly interesting results, this one has a field of view of 90 degrees:Īccording to Mark Lemmon - for typical dust loadings the brightness variation from horizon to zenith is no more than a factor of two and wouldn't be very visible to the naked eye. There is probably a fairly large, bright area in the sky near the sun, possibly less reddish (lower R/B ratio) than parts of the sky farther from the sun. The sky varies a lot because of variable amount of dust but the general impression I get is that the sky is bright near the horizon (usually brighter than the surface) but gets much darker higher in the sky. What would be best are mosaics showing the sky from the horizon (with the horizon/surface visible) and towards the zenith. So if anyone knows of more and/or better images I'm interested in them. I have found lots of images - by far the best ones I have found are from UMSF in this thread: To check the results I have been looking for spacecraft images to use as ground truth. I have been attempting to make computer generated images of the Martian atmosphere, both as seen from the surface and from space. ![]()
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