Question regarding Huygens surface video |
Question regarding Huygens surface video |
Dec 18 2016, 03:03 AM
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#16
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Senior Member Group: Members Posts: 2106 Joined: 13-February 10 From: Ontario Member No.: 5221 |
There was a publication a few months ago purporting to detect a fog bank, but Erich says while one can't exclude it, it's at the noise level. Ralph A good summary of this claim here: http://www.planetary.org/blogs/guest-blogs...e-of-titan.html |
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Dec 18 2016, 12:36 PM
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#17
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Junior Member Group: Members Posts: 43 Joined: 14-December 12 Member No.: 6784 |
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Dec 19 2016, 07:15 PM
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#18
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Member Group: Members Posts: 656 Joined: 20-April 05 From: League City, Texas Member No.: 285 |
...But THE MOST IMPORTANT THING is to read the very detailed DISR Users Guide (which hasn't actually been on the PDS for terribly long) http://atmos.pds.nasa.gov/data_and_service...gens/disr1.html ... Thanks, Ralph, that is an amazingly good reference. Also, thanks to PDP8 for the fast cosine function. Will have to see how bogged-down I get in simulation |
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Jan 4 2017, 02:53 PM
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#19
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Junior Member Group: Members Posts: 52 Joined: 16-November 06 Member No.: 1364 |
Erich analyzed the little spots and determined they were all radiation hits on the detector, except for the one feature in the bottom left of image 897, which seems to be a dewdrop from methane sweated out of the ground by the lamp. (Note they may be hits from neutrons from the RHUs - the rate of cosmic rays should be very low in Titan's thick atmosphere). That's this paper. The DISR lamp flux was constant after landing. The brightness distribution over the images slowly changed, however, most likely because of charge build-up on the CCD. If there was a fog, Erich would have found it. |
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