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  • Other Sources  (4)
  • 2010-2014
  • 1990-1994  (4)
  • 1991  (4)
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  • 2010-2014
  • 1990-1994  (4)
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  • 1
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    Triton's global heat budget (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Internal heat flow from radioactive decay in Triton's interior along with absorbed thermal energy from Neptune total 5 to 20 percent of the isolation absorbed by Triton, thus comprising a significant fraction of Triton's surface energy balance. These additional energy inputs can raise Triton's surface temperature between about 0.5 and 1.5 K above that possible with absorbed sunlight alone, resulting in an increase of about a factor of about 1.5 to 2.5 in Triton's basal atmospheric pressure. If Triton's internal heat flow is concentrated in some areas, as is likely, local effects such as enhanced sublimation with subsequent modification of albedo could be quite large. Furthermore, indications of recent global albedo change on Triton suggest that Triton's surface temperature and pressure may not now be in steady state, further suggesting that atmospheric pressure on Triton was as much as ten times higher in the recent past.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science (ISSN 0036-8075); 251; 1465-146
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Disk resolved studies of the optical properties and physical nature of the surfaces of the outer planet satellites (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The spatially resolved albedo, color, compaction state, roughness, and constituent particle sizes of the surfaces of the satellites of Saturn, Uranus, and Jupiter provide important constraints in understanding the geologic evolution and relevant exogenic processes operating in these satellite systems. Some details of observations are given.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990; p 288-290
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Triton's global heat budget (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Internal heat flow from radioactive decay in Triton's interior along with absorbed thermal energy from Neptune total 5 to 20 percent of the insolation absorbed by Triton, thus comprising a significant fraction of Triton's surface energy balance. These additional energy inputs can raise Triton's surface temperature between approx. 0.5 to 1.5 K above that possible with absorbed sunlight alone, resulting in a factor of approx. 1.5 to 2.5 increase in Triton's basal atmospheric pressure. If Triton's internal heatflow is concentrated in some areas, as is likely, local effects such as enhanced sublimation with subsequent modification of albedo could be quite large. Furthermore, indications of recent albedo change on Triton suggest that Triton's surface temperature and pressure may not now be in steady state, further suggesting that atmospheric pressure on Triton was as much as 10 times higher in the recent past.
    Keywords: SPACE RADIATION
    Type: NASA-CR-188178 , NAS 1.26:188178
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Galileo infrared imaging spectroscopy measurements at Venus (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: During the 1990 Galileo Venus flyby, the Near Infrared Mapping Spectrometer investigated the night-side atmosphere of Venus in the spectral range 0.7 to 5.2 micrometers. Multispectral images at high spatial resolution indicate substantial cloud opacity variations in the lower cloud levels, centered at 50 kilometers altitude. Zonal and meridional winds were derived for this level and are consistent with motion of the upper branch of a Hadley cell. Northern and southern hemisphere clouds appear to be markedly different. Spectral profiles were used to derive lower atmosphere abundances of water vapor and other species.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science (ISSN 0036-8075); 253; 1541-154
    Format: text
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    NASA TECHNICAL REPORTS
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