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Browsing National Air and Space Museum by Author "Phillips, Roger J."

Browsing National Air and Space Museum by Author "Phillips, Roger J."

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  • 3D Imaging Of Mars Polar Ice Caps Using Orbital Radar Data 
    Foss, Frederick J., II; Putzig, Nathaniel E.; Campbell, Bruce A.; Phillips, Roger J. (2017)
  • Accommodation of Lithospheric Shortening on Mercury from Altimetric Profiles of Ridges and Lobate Scarps Measured during MESSENGER Flybys 1 and 2 
    Zuber, Maria T.; Montési, Laurent G. J.; Farmer, Grant T.; II, Steven A. Hauck; Ritzer, J. Andreas; Phillips, Roger J.; Solomon, Sean C.; Smith, David E.; Talpe, Matthieu J.; III, James W. Head; Neumann, Gregory A.; Watters, Thomas R.; Johnson, Catherine L. (2010)
    The Mercury Laser Altimeter on the {NASA} {MESSENGER} mission has ranged to several ridges and lobate scarps during two equatorial flybys of the planet Mercury. The tectonic features sampled, like others documented by ...
  • Examination of gully sites on Mars with the shallow radar 
    Nunes, Daniel Cahn; Smrekar, Suzanne E.; Safaeinili, Ali; Holt, John W.; Phillips, Roger J.; Seu, Roberto; Campbell, Bruce A. (2010)
    Martian gullies, found on steep slopes along broad mid-latitudinal bands, have morphologies resembling those of water-carved gullies on Earth and have been dated to <10 Ma. As such, one of the leading hypotheses, though ...
  • Finite element modeling of short-wavelength folding on Venus: Implications for the plume hypothesis for crustal plateau formation 
    Ghent, Rebecca R.; Phillips, Roger J.; Hansen, Vicki L.; Nunes, Daniel C. (2005)
    The key geological observations and structural interpretations associated with the current plume hypothesis for Venusian crustal plateau formation are that (1) short-wavelength, spatially periodic tectonic structures ...
  • The Morphology of Mercury's Caloris Basin as Seen in MESSENGER Stereo Topographic Models 
    Oberst, Jürgen; Preusker, Frank; Phillips, Roger J.; Watters, Thomas R.; Head, James W.; Zuber, Maria T.; Solomon, Sean C. (2010)
    A digital terrain model (1000-m effective spatial resolution) of the Caloris basin, the largest well-characterized impact basin on Mercury, was produced from 208 stereo images obtained by the {MESSENGER} narrow-angle camera. ...
  • Radar Sounding of the Medusae Fossae Formation Mars: Equatorial Ice or Dry, Low-Density Deposits? 
    Watters, Thomas R.; Campbell, Bruce A.; Carter, Lynn M.; Leuschen, Carl J.; Plaut, Jeffrey J.; Picardi, Giovanni; Orosei, Roberto; Safaeinili, Ali; Clifford, Stephen M.; Farrell, William M.; Ivanov, Anton B.; Phillips, Roger J.; Stofan, Ellen R. (2007)
    The equatorial Medusae Fossae Formation (MFF) is enigmatic and perhaps among the youngest geologic deposits on Mars. They are thought to be composed of volcanic ash, eolian sediments, or an ice-rich material analogous to ...
  • Return to Mercury: A Global Perspective on MESSENGER's First Mercury Flyby 
    Solomon, Sean C.; McNutt, Ralph L.; Watters, Thomas R.; Lawrence, David J.; Feldman, William C.; Head, James W.; Krimigis, Stamatios M.; Murchie, Scott L.; Phillips, Roger J.; Slavin, James A.; Zuber, Maria T. (2008)
    In January 2008, the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft became the first probe to fly past the planet Mercury in 33 years. The encounter revealed that Mercury is a dynamic ...
  • Shallow radar (SHARAD) sounding observations of the Medusae Fossae Formation, Mars 
    Carter, Lynn M.; Campbell, Bruce A.; Watters, Thomas R.; Phillips, Roger J.; Putzig, Nathaniel E.; Safaeinili, Ali; Plaut, Jeffrey J.; Okubo, Chris H.; Egan, Anthony F.; Seu, Roberto; Biccari, Daniela; Orosei, Roberto (2009)
    The SHARAD (shallow radar) sounding radar on the Mars Reconnaissance Orbiter detects subsurface reflections in the eastern and western parts of the Medusae Fossae Formation (MFF). The radar waves penetrate up to 580 m of ...
  • Studies Of Lava Flows in the Tharsis Region of Mars Using Shallow Radar (SHARAD) 
    Simon, Molly N.; Carter, Lynn M.; Campbell, Bruce A.; Phillips, Roger J.; Mattei, Stefania (2014)
    The Tharsis region of Mars is covered in volcanic flows that can stretch for tens to hundreds of kilometers. Radar measurements of the dielectric properties of these flows can provide information regarding their composition ...
  • Three-dimensional radar imaging of structures and craters in the Martian polar caps 
    Putzig, Nathaniel E.; Smith, Isaac B.; Perry, Matthew R.; Foss II, Frederick J.; Campbell, Bruce A.; Phillips, Roger J.; Seu, Roberto (2018)
    Over the last decade, observations acquired by the Shallow Radar (SHARAD) sounder on individual passes of the Mars Reconnaissance Orbiter have revealed the internal structure of the Martian polar caps and provided new ...

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