i have a dimple too

Could these dimples be caused by vertical von Karman vortices? http://en.wikipedia.org/wiki/Kármán_vortex_street

Perhaps a steady slow flow of wind on top of a thin layer of sublimated gas covering the surface creating small dimple sized vertical swirls ( waves rolling along versus tornadoes) allowing areas of lower pressure on the surface promoting sublimation? the linear organization or patterning could then be horizontal interference. http://physics.stackexchange.com/questions/104778/how-can-a-wave-interfere-with-itself
http://i.stack.imgur.com/Au3fb.jpg

P.S. what hashtag are you guys using for these dimples

Posted December 4, 2014 8:01 AM

by Kitharode moderator

Hi Mote. I'm not sure they're dimples. They look to me like embryonic spiders. Left/upper side of channel in sunlight, with right/lower side in shadow. 😦

Posted December 4, 2014 11:26 AM

by p.titchin in response to Kitharode's comment.

Also note how linear they are over the length of the image ? young yardangs?~ Pete

Posted December 4, 2014 7:15 PM

by Kitharode moderator

Mote: In case you've not met yardangs yet, there's a blog post here. Cheers.

Posted December 5, 2014 1:54 PM