Directional variations in thermal emission from geologic surfaces

Details Directional variations in thermal emission from geologic surfaces Directional variations in thermal emission from geologic surfaces

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..985j&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, June 1990, p. 985-988. Research supported by NASA and University of Colo

Mathematics

Logic

14

Lunar Surface, Planetary Geology, Planetary Surfaces, Surface Roughness, Thermal Emission, Brightness Temperature, Lunar Craters, Remote Sensing

Scientific paper

The directional emission properties of geologic surfaces were investigated using a ground-based, hand-held infrared radiometer and thermistor probe. Field sites involved surfaces ranging from smooth playa and sand surfaces to a very rough aa lava flow. Large directional variations in thermal emission were found; they result from the presence of surface roughness at large scales producing spatial variations in kinetic temperature and at small scales producing emissivity variations. These variations are important in remotely determining surface structure and understanding surface energy balance and emission spectra.

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