Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987em%26p...37...59t&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 37, Jan. 1987, p. 59-70.
Astronomy and Astrophysics
Astronomy
31
Computer Aided Mapping, Lunar Maps, Lunar Radar Echoes, Radar Astronomy, Radar Maps, Circular Polarization, Fast Fourier Transformations, High Resolution, Lunar Maria, Radar Antennas, Radar Beams, Radar Scattering, Signal To Noise Ratios
Scientific paper
New radar observations of the moon in 1981-1984 were made using the 430 MHz (70 cm wavelength) radar at the Arecibo observatory, Puerto Rico. The new observations have produced a high resolution lunar radar map with radar cell-sizes near 2-5 km. This new resolution is a three-fold improvement over the previous mapping done in the late 1960's. Since the Arecibo radar antenna beam is only ten arc-minutes (about one-third of the width of the lunar disk), this new map is a mosaic of some eighteen observations. A radar-metric control between the various pieces of the mosaic was obtained via a 'beam-swing', limb-to-limb calibration. When the limb-to-limb calibration was combined with the mosaic, there were significant radar scattering differences across the maria. Eastern Mare Tranquillitatis and western Oceanus Procellarum have weaker echoes than other maria, while the central portion of Mare Serenitatis and northern Mare Imbrium have stronger echoes. There is a radar scattering difference across the southern terra as areas nearer Mare Orientale have stronger echoes than areas further from Mare Orientale.
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