Preliminary Infrared Radiometry of the Night Side of Mercury from Mariner 10

Details Preliminary Infrared Radiometry of the Night Side of Mercury from Mariner 10 Preliminary Infrared Radiometry of the Night Side of Mercury from Mariner 10

Jul 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974sci...185..142c&link_type=abstract

Science, Volume 185, Issue 4146, pp. 142-145

Physics

6

Scientific paper

The infrared radiometer on Mariner 10 measured the thermal emission from the planet with a spatial resolution element as small as 40 kilometers in a broad wavelength band centered at 45 micrometers. The minimum brightness temperature (near local midnight) in these near-equatorial scans was 100 degrees K. Along the track observed, the temperature declined steadily from local sunset to near midnight, behaving as would be expected for a homogeneous, porous material with a thermal inertia of 0.0017 cal cm-2 sec-1/2 degrees K-1, a value only slightly larger than that of the moon. From near midnight to dawn, however, the temperature fluctuated over a range of about 10 degrees K, implying the presence of regions having thermal inertia as high as 0.003 cal cm-2 sec-1/2 degrees K-1.

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