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Zisk, S. H.

Publications and source records attributed to Zisk, S. H..

45 records · Page 3
All sourcesNASA NTRSDOE OSTI
NASA NTRS1972

Radar mapping of lunar surface roughness.

Comparison of anomalous behavior at infrared and radar wavelengths provides an estimation of lunar surface structure at centimeter-to-meter sizes. Although a simple classification is used, it is shown that the combination of the infrared and radar data contains more information than any of the sets by themselves. The infrared data indicate that bare surface rocks are the source of the roughness which generates enhanced radar backscatter. The different radar maps indicate the size of surface rocks, as was demonstrated for the strewn fields of centimeter-sized rubble (the Type II anomaly). As craters age, they have a rim-bright appearance in the radar maps, and eventually lose their anomalous-behavior at infrared and 3.8-cm radar wavelengths.

Thompson, T. W.↗
NASA NTRS1972

Apollo 16 landing site: Summary of earth based remote sensing data, part W

Infrared and radar studies of the Apollo 16 landing site are summarized. Correlations and comparisons between earth based remote sensing data, IR observations, and other data are discussed in detail. Remote sensing studies were devoted to solving two problems: (1) determining the physical difference between Cayley and Descartes geologic units near the landing site; and (2) determining the nature of the bright unit of Descartes mountain material.

Zisk, S. H.↗
NASA NTRS1972

Calibration of radar data from Apollo 16 results, part X

Predictions of surface and near surface blockiness using earth based radar measurements were made. Two polarizations of the radar echoes were measured - polarized and depolarized. Particular attention was given to the depolarized echoes. North Ray and South Ray Craters and a 512-m diameter lunar crater in the Flamsteed Ring were used for the study.

Zisk, S. H.↗
NASA NTRS1967

Radio astronomy

Radio astronomy - Haystack-Millstone OH INTERFEROMETER, K-band spectrum measurements of sun, inference of atmospheric attenuation from balloon flights, and microwave emission

RADIO ASTRONOMY↗
NASA NTRS1966

Radio astronomy

Radio astronomy studies in 18-cm line emission sources, fringe visibility of bright radio sources, and spectral features of Venus and Jupiter

INTERFEROMETRY↗