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  • Communications and Radar  (3)
  • Lunar and Planetary Exploration  (2)
  • 1
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    Dunes and Microdunes on Venus: Why Were So Few Found in the Magellan Data? (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: A search through cycle 1, 2, and 3 Magellan radar data covering 98% of the surface of Venus revealed very few dunes. Only two possible dune fields and several areas that may contain microdunes smaller than the resolution of the images (75 m) were identified. The Aglaonice dune field was identified in the cycle I images by the specular returns characteristic of dune faces oriented perpendicular to the radar illumination. Cycle 1 and 2 data of the Fortuna-Meshkenet dune field indicate that there has been no noticeable movement of the dunes over an 8-month period. The dunes, which are oriented both parallel and perpendicular to the radar illumination, appear to be dark features on a brighter substrate. Bright and dark patches that were visible in either cycle 1 or 2 data, but not both, allowed identification of several regions in the southern part of Venus that may contain microdunes. The microdunes are associated with several parabolic crater deposits in the region and are probably similar to those formed in wind tunnel experiments under Venus-like conditions. Bragg scattering and/or subpixel reflections from the near-normal face on asymmetric microdunes may account for these bright and dark patches. Look-angle effects and the lack of sufficient sand-size particles seem to be the most likely reasons so few dunes were identified in Magellan data. Insufficient wind speeds, thinness of sand cover, and difficulty in identifying isolated dunes may also be contributors to the scarcity of dunes.
    Keywords: Lunar and Planetary Exploration
    Type: ICARUS (ISSN 0019-1035); Volume 112; 282-295
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The Spaceborne Imaging Radar-C, X-Band Synthetic Aperture radar (SIR-C/X-SAR) Mission Overview (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The Spaceborne Imaging Radar-C, X-Band Synthetic Aperture Radar (SIR-C/X-SAR) was launched on space shuttle Endeavour at 7:05 AM EDT, Saturday, April 9, 1994. Soon after launch, the radars were activated and began around the clock operations which lasted for the next 10 days.
    Keywords: Communications and Radar
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    NASA TECHNICAL REPORTS
  • 3
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    Overview of SIR-C/X-SAR Geologic Studies in Arid Regions (1996)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Keywords: Communications and Radar
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Shuttle Imaging Radar Application in Geology (2000)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Keywords: Communications and Radar
    Type: International Geological Congress; Rio de Janeiro; Brazil
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The Mars Express Subsurface Radar: Water and Ice Detection in the Polar Regions (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The European Space Agency (ESA) will conduct a mission to Mars during the 2003 launch opportunity, called Mars Express. Much of the payload is similar to that of the failed Mars 96 orbiter, but a completely new instrument has been selected for the payload, the Subsurface Sounding Radar/Altimeter (SSRA). The SSRA experiment is a joint project between the University of Rome, the Jet Propulsion Laboratory, and Alenia Aerospazio, Italy. This paper describes the science objectives of the experiment, the instrument characteristics, and applications of the SSRA investigation to studies of the martian polar regions.
    Keywords: Lunar and Planetary Exploration
    Type: The First International Conference on Mars Polar Science and Exploration; 31-32; LPI-Contrib-953
    Format: text
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    NASA TECHNICAL REPORTS
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