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  • 1975-1979  (4)
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  • 1
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    Unknown
    Martian north pole summer temperatures - Dirty water ice (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Broadband thermal and reflectance observations of the Martian north polar region in late summer yield temperatures for the residual polar cap near 205 K with albedos near 43 percent. The residual cap and several outlying smaller deposits are water ice with included dirt; there is no evidence for any permanent carbon dioxide polar cap.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 194; Dec. 17
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Viking infrared thermal mapper (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The infrared thermal mapper (IRTM) was designed to measure the emitted and reflected radiance of Mars. Carried by the Viking Orbiter, the IRTM contains four small Cassegrainian telescopes which each image the same, seven circular areas. There is a total of twenty-eight channels in four surface and one atmospheric thermal bands from 6 to 30 microns and a broad solar reflectance band. All channels are sampled simultaneously, using the spacecraft scanning capability to map the radiance over small and large areas of the planet. All channels use thermopile detectors; spectral passbands are determined by a combination of interference filters, detector lense materials, antireflection coatings, and restrahlen optics.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Applied Optics; 17; Apr. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Infrared thermal mapping of the Martian surface and atmosphere - First results (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Viking infrared thermal mapper measures the thermal emission of the Martian surface and atmosphere and the total reflected sunlight. With the high resolution and dense coverage being achieved, planetwide thermal structure is apparent at large and small scales. The thermal behavior of the best-observed areas, the landing sites, cannot be explained by simple homogeneous models. The data contain clear indications for the relevance of additional factors such as detailed surface texture and the occurrence of clouds. Areas in the polar night have temperatures distinctly lower than the CO2 condensation point at the surface pressure. This observation implies that the annual atmospheric condensation is less than previously assumed and that either thick CO2 clouds exist at the 20-kilometer level or that the polar atmosphere is locally enriched by noncondensable gases.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 193; Aug. 27
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Mariner 10 infrared radiometer results - Temperatures and thermal properties of the surface of Mercury (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Mariner 10 infrared brightness temperatures of the surface of Mercury at 11 and 45 microns are presented. The data were obtained during the first flyby along a near-equatorial swath extending from 17 hours local time through local midnight to 9 hours local time. For an assumed emissivity of 0.9, derived surface thermal inertias are between 0.0015 and 0.0031 cal/sq cm/sq root sec/K and the implied minimum predawn surface kinetic temperature for the warm pole at longitude 270 deg is near 93 K. Several pronounced thermal inhomogeneities were seen, one of which appears to coincide with a region of high radar reflectivity. The derived thermal properties, the electrical skin depth, and loss tangent fall within the range of values found on the moon.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 28; Aug. 197
    Format: text
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    NASA TECHNICAL REPORTS
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