Orbital radar evidence for lunar subsurface layering in Maria Serenitatis and Crisium
書誌事項
- 公開日
- 1978-07-10
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/jb083ib07p03459
- 公開者
- American Geophysical Union (AGU)
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説明
<jats:p>Data from the lunar‐orbiting Apollo 17 radar sounding experiment (60‐m wavelength) have been examined in both digital and holographic formats. Surface backscatter (clutter) which masks possible radar returns originating from subsurface changes in lunar electrical properties was reduced by simultaneously comparing radar data from two orbits. Radar returns that correlate from orbit to orbit form two distinct alignments in Mare Serenitatis and one in Mare Crisium. It is proposed that these alignments represent subsurface reflecting horizons. The hypothesis is tested by showing that (1) most of the radar returns fall outside the ambiguity region of the correlation technique, (2) the results are consistent between optically and digitally processed data, (3) the signal levels of the proposed subsurface features are well above the noise floor, (4) the inferred loss tangents appear to be consistent with returned sample measurements, and (5) the discontinuous nature of the reflections most likely arises from interference effects. It is concluded that there are two subsurface radar reflectors with mean apparent depths of 0.9 km and 1.6 km below the surface in Mare Serenitatis and one reflector at a mean depth of 1.4 km below the surface in Mare Crisium. These reflectors represent basin‐wide subsurface interfaces.</jats:p>
収録刊行物
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- Journal of Geophysical Research: Solid Earth
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Journal of Geophysical Research: Solid Earth 83 (B7), 3459-3468, 1978-07-10
American Geophysical Union (AGU)