[X] My Assistant

[volcanopele]

The latest PDS release for Cassini is now online at http://pds-imaging.jpl.nasa.gov/data/cassi...assini_orbiter/

I've posted the RADAR swaths from T48 and T49 at http://pirlwww.lpl.arizona.edu/~perry/RADAR/ . These swaths include observations of the ISS playa, Tui Regio (yep, it does look a lot like Hotei Regio), Shikoku Facula, Belet, and the southern mid-latitudes.

One image I want to highlight is from one of the T48 swaths. It covers northern Shikoku Facula. You can see a river channel running from a playa in the center of northern Shikoku east out to the margin between the Shangri-la dune fields and Shikoku. Very cool stuff.
http://pirlwww.lpl.arizona.edu/~perry/RADA...koku_Facula.jpg

[ngunn]

Great stuff. What happens when the liquids meet the dunes is a crucial question with big implications - for relative timescales of active processes amongst many others. At first glance that dunefield looks to me like it's been attacked and partly erased by the liquid flow, perhaps in a sudden brief event??

In the T49 I noticed what could be a similar situation, though less well resolved. A stream seems to originate just above a possible crater remnant and flow off to the left, cutting through dunes at right angles.

Attached thumbnail(s)

 

[titanicrivers]

Great stuff. What happens when the liquids meet the dunes is a crucial question with big implications - for relative timescales of active processes amongst many others. At first glance that dunefield looks to me like it's been attacked and partly erased by the liquid flow, perhaps in a sudden brief event??

Absolutely! Seeing changes over several years would also help answer a crucial 'timescale' question whether channels erase dunes or dunes cover channels. Looking at Shikoku over the time period 2006-2009 (click on graphic) seems to show no definitive changes in that regard. (main changes relate to SAR look angle and resolution).