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  • LUNAR AND PLANETARY EXPLORATION  (2)
  • SOLAR PHYSICS  (1)
  • 1
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    Ignition of global wildfires at the Cretaceous/Tertiary boundary (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The recent discovery of an apparently global soot layer at the Cretaceous/Tertiary boundary indicates that global wildfires were somehow ignited by the impact of a comet or asteroid. It is shown here that the thermal radiation produced by the ballistic reentry of ejecta condensed from the vapor plume of the impact could have increased the global radiation flux by factors of 50 to 150 times the solar input for periods ranging from one to several hours. This great increase in thermal radiation may have been responsible for the ignition of global wildfires, as well as having deleterious effects on unprotected animal life.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature (ISSN 0028-0836); 343; 251-254
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The evolution of solar ultraviolet luminosity (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Astronomical observations of stars analogous to the sun are used to construct a tentative account of the evolution of solar UV luminosity. Evidence exists that the young sun was a much more powerful source of energetic particles and radiation than it is today, and while on the main sequence, solar activity has declined as an inverse power law of age as a consequence of angular momentum loss to the solar wind. Observations of pre-main sequence stars indicate that before the sun reached the main sequence, it may have emitted as much as ten thousand times the amount of ultraviolet radiation that it does today. The impact of the results on knowledge of photochemistry and escape of constituents of primordial planetary atmospheres is discussed.
    Keywords: SOLAR PHYSICS
    Type: Reviews of Geophysics and Space Physics; 20; May 1982
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    NASA TECHNICAL REPORTS
  • 3
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    Lunar nodal tide and distance to the moon during the Precambrian (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The first direct determination of the lunar distance in the Precambrian is presented. A 23.3 + or - 0.3 yr periodicity preserved in 2500 Myr BP Australian banded iron formation is interpreted as reflecting the climatic influence of the lunar nodal tide, which has been detected with its modern 18.6-yr periodicity in some modern climate records. The lunar distance at 2500 Myr BP would then have been about 52 earth radii. The implied history of precambrian tidal friction is in accord with both the more recent paleontological evidence and the long-term stability of the lunar orbit. The length of the Milankovitch cycles that modulate the ice ages today also evolve with the earth-moon system. Their detection in the Precambrian sedimentary record would then permit an independent determination of the lunar distance.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature (ISSN 0028-0836); 320; 600-602
    Format: text
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    NASA TECHNICAL REPORTS
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