Computer Science – Sound
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998nvmi.conf...21b&link_type=abstract
Workshop on New Views of the Moon: Integrated Remotely Sensed, Geophysical, and Sample Datasets, p. 21
Computer Science
Sound
Caves, Lava, Lunar Bases, Lunar Surface, Underground Structures, Lunar Shelters, Tunnels, Clementine Spacecraft, Ground Penetrating Radar, Radar Imagery, Very Long Baseline Array (Vlba)
Scientific paper
A Radar Flashbulb on the Moon: Lava-tube caves under the lunar surface may be very useful as lunar base sites. They have left surface indicators that can be found in computerized searches of the Clementine data. Such a search is being put together by the Lunar Base Research Team (LBRT) of the Oregon L-5 Society, Portland's local chapter of the National Space Society. Lava-tube sites that are located will need to undergo further investigation before committment to a lunar base can be made. Ground-penetrating radar images of actual voids at particular sites would seem to be the next step, if images can be obtained cheaply. This paper describes what LBRT believes is the cheapest combination of technologies that can obtain such images of lava-tube voids on the Moon. As early as the Apollo Lunar Sounder Experiment, radar has penetrated the Moon to substantial depths. Only soundings were possible, given the combination of penetrating wavelengths (1-20 m) and the aperture of any antenna that could be carried by the Apollo Service Module. Now, operation of the Very Long Baseline Array (VLBA) by NRAO provides an aperture that, even from the Earth, could provide a resolution of 25-50 m at the lunar surface with wavelengths of 0.5-1 m. The Lunar Sourcebook notes that much of the lunar surface is rather transparent to radio waves, because of its low conductivity and lack of water. Lava-tube surface indicators have been found in Apollo photos for caves up to 1100 m across. But where is the radar energy reflecting off the walls of these lava-tube voids to come from?
Billings T.
Godshalk E.
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