Lakes in the limelight, the 2013 image bonanza continues |
Lakes in the limelight, the 2013 image bonanza continues |
Sep 13 2013, 02:20 PM
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
A fantastic collection of new images of the northern lakes has just arrived: http://saturn.jpl.nasa.gov/photos/raw/rawi...?imageID=298704
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Apr 23 2017, 07:23 AM
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#2
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
I have a question about the way patches of bubbles might produce RADAR reflections. Please excuse me if the answer is already in one of the papers: I don't have access. Are we talking about bubbles distributed through the body of the liquid or a raft of some sort of scum accumulating on the surface?
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Apr 23 2017, 07:52 PM
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#3
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Member Group: Members Posts: 611 Joined: 23-February 07 From: Occasionally in Columbia, MD Member No.: 1764 |
I have a question about the way patches of bubbles might produce RADAR reflections. Please excuse me if the answer is already in one of the papers: I don't have access. Are we talking about bubbles distributed through the body of the liquid or a raft of some sort of scum accumulating on the surface? These are quite distinct hypotheses. Floating material (e.g. pumice rafts, or some sort of bubble foam) could explain both radar and near-IR brightness, as could surface roughness from wind or currents. A bubble plume, with voids in the methane column, could give radar backscatter, but not near-IR. A bubble plume would be expected to be anchored to the seafloor somehow ; floating material would be pushed around a lot by wind, so the magic island's recurrence at one spot might argue somewhat against it, although some sort of pumice analog continuously/episodically released from a seafloor volcano would have some preference for location, I guess. |
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