Titan's topography, strange.... |
Titan's topography, strange.... |
Apr 12 2009, 12:44 PM
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Recent article in Science by Zebker et al.:
Zebker et al. Science in press, "Size and Shape of Saturn's Moon Titan". doi: 10.1126/science.1168905 (published online April 2, 2009) Link to abstract (pay-for article): http://www.sciencemag.org/cgi/content/abstract/1168905 Article on spaceref discusses this paper: http://www.spaceref.com/news/viewpr.html?pid=27912 Figure 3 from the Science article is a global elevation map relative to barycenter. Key points of article:
"Xanadu seems to be systematically lower than other parts of the equatorial belt, and not uplifted like most mountainous areas on Earth." (quote from Fig. 3 caption in article) -Mike -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Apr 15 2009, 05:32 PM
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#2
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Two different wind regimes, but with one component larger than the other, can form linear dunes with the vector addition product.
But sand movement will be the time-average of the relative strength of the two alternate regimes. The sand movement vector can be different from the dune alignment vector. Check out this section of a book preview here (Note how the dune pattern changes around Australia due to interaction of winds with the seasonal anticyclonic high. This might be an example of what Ralph was mentioning above, i.e. Xanadu having a permanent pressure system.) -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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