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Jason W. Barnes Associate Professor of Physics University of Idaho and the Cassini VIMS Team

Specular Reflections from Titan’s Punga Mare Seen by Cassini/VIMS Indicate Surface Roughness: Waves?. Jason W. Barnes Associate Professor of Physics University of Idaho and the Cassini VIMS Team. Lunar and Planetary Science Conference 2014 March 17 Houston, TX. T85 CM_1721848119_1.

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Jason W. Barnes Associate Professor of Physics University of Idaho and the Cassini VIMS Team

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  1. Specular Reflections from Titan’s Punga Mare Seen by Cassini/VIMS Indicate Surface Roughness: Waves? Jason W. Barnes Associate Professor of Physics University of Idaho and the Cassini VIMS Team Lunar and Planetary Science Conference 2014 March 17 Houston, TX

  2. T85 CM_1721848119_1

  3. T85 CM_1721848119_1

  4. T85 CM_1721848119_1

  5. Lakes from a Plane at Dusk

  6. Inferring Wave Height

  7. Bottomless Lakes, NM (thanks Karl Mitchell)

  8. Conclusions • Off-specular signal in Punga Mare from T85 indicates roughened, liquid surface • Typical slope angle 6 +/- 1 degrees • Possibilities: • Waves • Wet, liquid-covered mudflat • Moist or partially dry surface • Waves seems most likely, given T94 VIMS obs of Punga, and spatially isolated nature of wave activity • Isolated wave patches, locally induced by winds just at or above threshold – 2cm high • First extraterrestrial ocean waves! • Titan’s seas are liquid, and don’t have viscosity of molasses • Indicates winds picking up as northern spring progresses? • Specular wave searches can constrain winds in the future

  9. Tilt Needed for Specular

  10. Facet Directions, with Sun

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