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Dunes inside Victoria
ngunn
post Nov 6 2006, 03:22 PM
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Looking at the Victoria dunefield it strongly resembles the patterns of sand grains on a vibrating tin lid. I have started to wonder if resonance could indeed be involved. Something along the lines of standing sound waves within the crater producing displacement nodes and antinodes that could cause very light particles to migrate to the nodes. Next question: given the dune wavelengths what would be the predominant frequencies of these sound waves? Would they be audible or infrasonic? At this point I realised I have no idea what the speed of sound is at Victoria. Any relevant facts or opinions to constrain my rambling thoughts would be most welcome. Likewise any pointers to previous discussion along these lines.
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ngunn
post Nov 7 2006, 01:17 PM
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the picture I tried to link to above:
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- ngunn   Dunes inside Victoria   Nov 6 2006, 03:22 PM
- - Cugel   The speed of sound on Mars at "Sea" leve...   Nov 6 2006, 04:16 PM
|- - climber   QUOTE (Cugel @ Nov 6 2006, 05:16 PM) The ...   Nov 6 2006, 08:56 PM
|- - Cugel   QUOTE (climber @ Nov 6 2006, 09:56 PM) OT...   Nov 7 2006, 09:15 AM
- - AndyG   Hi ngunn, Mars' speed of sound is around 240 ...   Nov 6 2006, 04:22 PM
|- - ustrax   QUOTE (AndyG @ Nov 6 2006, 04:22 PM) Hi n...   Nov 6 2006, 04:31 PM
- - Bill Harris   The interior dunes in many Martian craters are cla...   Nov 6 2006, 05:25 PM
- - MarkL   The dune field as a whole shows a lot of regularit...   Nov 6 2006, 07:11 PM
- - ngunn   An excellent bunch of replies so far, thanks to yo...   Nov 6 2006, 09:05 PM
- - ngunn   Almost forgotten those probably fictitious sound f...   Nov 6 2006, 09:26 PM
- - CosmicRocker   This is an interesting topic. I really don't ...   Nov 7 2006, 03:47 AM
- - Bill Harris   Good find, Tom. Network Dunes is the exact descri...   Nov 7 2006, 11:28 AM
- - ngunn   I'm having trouble finding anything on network...   Nov 7 2006, 12:10 PM
- - kenny   My recollection is that barchans (cresecent dunes)...   Nov 7 2006, 12:37 PM
- - ngunn   Another nice example part way down this fractals p...   Nov 7 2006, 12:42 PM
- - ngunn   the picture I tried to link to above:   Nov 7 2006, 01:17 PM
- - kenny   An amazing picture, when you inspect the crater bo...   Nov 7 2006, 01:34 PM
|- - ngunn   QUOTE (kenny @ Nov 7 2006, 01:34 PM) At s...   Nov 7 2006, 02:50 PM
- - Gray   Also consider that the sediment in the bottom of V...   Nov 7 2006, 04:59 PM
|- - JonClarke   QUOTE (Gray @ Nov 7 2006, 04:59 PM) Also ...   Nov 9 2006, 10:46 AM
- - MarkL   Great photo. Thanks. Perhaps a HiRise candidate?...   Nov 7 2006, 06:25 PM
|- - ngunn   QUOTE (MarkL @ Nov 7 2006, 06:25 PM) Grea...   Nov 7 2006, 06:55 PM
- - jamescanvin   OK folks, eye strain time. Here is a long baseline...   Nov 9 2006, 08:33 AM
|- - AndyG   QUOTE (jamescanvin @ Nov 9 2006, 08:33 AM...   Nov 9 2006, 09:46 AM
|- - fredk   QUOTE (jamescanvin @ Nov 9 2006, 08:33 AM...   Nov 9 2006, 04:15 PM
- - Gray   When I used the term 'sand', I was simply ...   Nov 9 2006, 02:12 PM
|- - JonClarke   QUOTE (Gray @ Nov 9 2006, 02:12 PM) When ...   Nov 9 2006, 09:16 PM
- - MarkL   I think the difference is grain/particle size. Ma...   Nov 10 2006, 02:04 PM
|- - JonClarke   QUOTE (MarkL @ Nov 10 2006, 02:04 PM) I t...   Nov 11 2006, 05:21 AM
- - Gray   Thanks for the link, Mark. That helped clear up a...   Nov 10 2006, 02:35 PM
- - edstrick   Ron Greeley and his crew of grad students and post...   Nov 11 2006, 11:57 AM
|- - JonClarke   QUOTE (edstrick @ Nov 11 2006, 11:57 AM) ...   Nov 11 2006, 09:50 PM
- - nprev   Good info, Ed. Thanks! I'd sure like to...   Nov 11 2006, 03:08 PM
- - MarkL   Not to nitpick but, the full quote is "The ...   Nov 11 2006, 08:05 PM
|- - JonClarke   QUOTE (MarkL @ Nov 11 2006, 08:05 PM) Dus...   Nov 11 2006, 09:21 PM
|- - MarkL   QUOTE (JonClarke @ Nov 11 2006, 09:21 PM)...   Nov 12 2006, 01:13 AM
- - Bill Harris   As we've said before, processes on Mars are si...   Nov 11 2006, 08:36 PM
|- - JonClarke   QUOTE (Bill Harris @ Nov 11 2006, 08:36 P...   Nov 11 2006, 09:27 PM
- - edstrick   One of the "surprising" -- at least some...   Nov 12 2006, 09:57 AM
|- - JonClarke   QUOTE (edstrick @ Nov 12 2006, 09:57 AM) ...   Nov 12 2006, 08:23 PM
|- - sranderson   Well, Purgatory sure looked to me to be made predo...   Nov 16 2006, 01:38 AM
|- - JonClarke   QUOTE (sranderson @ Nov 16 2006, 01:38 AM...   Nov 19 2006, 11:11 AM
- - kenny   Have we noticed that there appears to be another a...   Nov 17 2006, 09:46 PM
- - Gray   I saw those too. They show up as little "wri...   Nov 18 2006, 04:21 PM
- - Stu   They look quite nice looking down from the edge......   Nov 19 2006, 07:11 AM
- - tdemko   Just out in the most recent Earth and Planetary Sc...   Nov 20 2006, 09:20 PM
|- - ngunn   Ambitious title and very interesting abstract. If ...   Nov 20 2006, 09:32 PM
|- - JonClarke   QUOTE (tdemko @ Nov 20 2006, 09:20 PM) Ju...   Nov 23 2006, 07:06 AM
- - CosmicRocker   It's truly unfortunate that it is so expensive...   Nov 21 2006, 06:03 AM
|- - leustek   QUOTE (CosmicRocker @ Nov 21 2006, 01:03 ...   Nov 22 2006, 01:51 AM
|- - ToSeek   Also available on Arxiv.   Nov 22 2006, 06:15 PM
|- - imipak   QUOTE (CosmicRocker @ Nov 21 2006, 06:03 ...   Nov 22 2006, 08:09 PM
- - ngunn   Gottit! Thanks CosmicRocker tdemko thanks fo...   Nov 21 2006, 09:57 AM
- - MarkL   It is a bit hard to take. The cost of distributio...   Nov 21 2006, 02:44 PM
- - Gray   Tim, Thanks very much for pointing us to that arti...   Nov 21 2006, 03:40 PM
- - ngunn   http://hiroc.lpl.arizona.edu/images/TRA/TRA_000861...   Nov 23 2006, 03:48 PM
- - kenny   New detail in the dunes inside Endurance crater ar...   Dec 1 2006, 05:02 PM

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