Cloud hunting between flybys, more distant views |
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Cloud hunting between flybys, more distant views |
 Oct 2 2009, 09:32 PM
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#76
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 Senior Member  Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542  |
QUOTE (Jason W Barnes @ Oct 2 2009, 08:45 PM)  Heh -- I probly shoulda said somethin' earlier  UNQUOTE: No, that was just me being stupid, and anyhow I'm probably one of only a few interested parties without easy access to the journals. Glad to be of service Ahem. While you're on the line, I still haven't seen the Huygens landing site VIMS image without those annoying annotations. Have I missed a paper there too? |
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Oct 2 2009, 09:43 PM
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#77
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 Member Group: Members Posts: 131 Joined: 30-August 06 From: Moscow, Idaho Member No.: 1086 |
QUOTE (ngunn @ Oct 2 2009, 02:32 PM) Ahem. While you're on the line, I still haven't seen the Huygens landing site VIMS image without those annoying annotations. Have I missed a paper there too? Lets see . . . That was T47, right? Those data are public now, so it should be kosher to leak the image. Lemme check with the author and see what the status of the paper is and whether I should leak it or make you wait for the paper - Jason |
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Aug 18 2010, 11:36 PM
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#78
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 Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Seems like an appropriate place to put a recent observation of an equatorial cloud. Right there near Sotra Facula.
http://saturn.jpl.nasa.gov/photos/raw/rawi...?imageID=225159 -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Aug 19 2010, 03:21 AM
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#79
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Member Group: Members Posts: 699 Joined: 1-April 08 From: Minnesota ! Member No.: 4081 |
Absolutely !!! Looking back at August 13th images (see left below) shows no apparent cloud feature over Sotra Facula. The CL1CB3 filter images from August 17th (see below on right) now shows what appears to be a cloud. The coordinates of the cloud are approx. 10 S latitude and 40 W longitude.
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Sep 14 2010, 04:50 AM
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#80
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Member Group: Members Posts: 699 Joined: 1-April 08 From: Minnesota ! Member No.: 4081 |
Images from Rev 137 cloud monitoring taken Sept 10, 2010 did not seem to show significant clouds. Enhanced CL1 CB3 image below (N00163052) displays the Adiri and Belet areas.
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Sep 21 2010, 07:33 AM
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#81
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Member Group: Members Posts: 699 Joined: 1-April 08 From: Minnesota ! Member No.: 4081 |
Titan images N00163165 CL1 UV3 with its northern band and ? southern polar band and N00163162 CL1 CB3 surface views from Sept 13th are colorized and shown with Celestia surface and label overlay view. No distinct clouds were visible. Kraken can just be seen in the CL1 CB3 view. Images rotated so North is up.
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Sep 22 2010, 03:31 AM
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#82
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Graphic that shows cloud locations on Titan from July 2004 to April 2010: PIA13401
-------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Sep 22 2010, 06:00 AM
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#83
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 Senior Member Group: Moderator Posts: 3231 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
They certainly have a... permissive definition for "cloud". I never really counted that ethane stuff in the north.
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Sep 22 2010, 07:23 AM
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#84
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Rover Driver Group: Members Posts: 1015 Joined: 4-March 04 Member No.: 47 |
Yes, a bit confusing, as the other plot in that press release ( http://saturn.jpl.nasa.gov/news/cassinifea...eature20100921/ ) does show north polar tropospheric clouds, but I guess they're talking about the ethane cloud.
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Sep 22 2010, 01:33 PM
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#85
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
How did they define cloud coverage? Actual pixel density (cloud thickness), or binary y/n there is a change in expected pixel value?
(Would a thick heavy cumulus cloud count the same as a thin stratus cloud?) -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Sep 22 2010, 05:00 PM
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#86
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 Senior Member Group: Members Posts: 2173 Joined: 28-December 04 From: Florida, USA Member No.: 132 |
QUOTE (Juramike @ Sep 22 2010, 09:33 AM) How did they define cloud coverage? Actual pixel density (cloud thickness), or binary y/n there is a change in expected pixel value? (Would a thick heavy cumulus cloud count the same as a thin stratus cloud?) And what about fog? Or thog (tholins + fog)? |
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Sep 22 2010, 07:29 PM
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#87
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Member Group: Members Posts: 699 Joined: 1-April 08 From: Minnesota ! Member No.: 4081 |
http://www.gps.caltech.edu/~mbrown/papers/...louds_final.pdf
The best discussion I have found on this and contrasting views of Brown and Rodriquez on cloud density etc. can be found in the above article. |
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