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Radar images of MarsVLA radar-reflected flux-density mappings have yielded full disk images of Mars which reveal near-surface features, including a region in the Tharsis volcano area that displayed no echo to the very low level of the radar-system noise. This feature is interpreted as a deposit of dust or ash whose density is less than about 0.5 g/cu cm; it must be several meters thick, and may be much deeper. The most strongly reflecting geological feature was the south polar ice cap, which is interpretable as arising from nearly-pure CO2 or H2O ice, with less than 2 vol pct Martian dust. Only one anomalous reflecting feature was identified outside the Tharsis region.
Document ID
19910069528
Document Type
Reprint (Version printed in journal)
Authors
Muhleman, Duane O. (California Inst. of Tech. Pasadena, CA, United States)
Butler, Bryan J. (California Insitute of Technology Pasadena, United States)
Grossman, Arie W. (Maryland, University College Park, United States)
Slade, Martin A. (JPL Pasadena, CA, United States)
Date Acquired
August 14, 2013
Publication Date
September 27, 1991
Publication Information
Publication: Science
Volume: 253
ISSN: 0036-8075
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NAGW-1499
CONTRACT_GRANT: NSF AST-89-19698
Distribution Limits
Public
Copyright
Other