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  • GEOPHYSICS  (2)
  • ASTRONOMY  (1)
  • 1
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    Spectral analysis of the Elatina varve series (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Elatina formation in South America, which provides a rich fossil record of presumptive solar activity in the late Precambrian, is of great potential significance for the physics of the sun because it contains luminae grouped in cycles of about 12, an appearance suggestive of the solar cycle. Here, the laminae are treated as varves laid down yearly and modulated in thickness in accordance with the late Precambrian sunspot activity for the year of deposition. The purpose is to present a simple structure, or intrinsic spectrum, that will be uncovered by appropriate data analysis.
    Keywords: GEOPHYSICS
    Type: NASA-CR-183085 , NAS 1.26:183085 , CSSA-ASTRO-88-13 , AD-A199380
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    An orbiting infrared interferometer to search for nonsolar planets (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: This paper proposes an orbiting infrared interferometer with its fringe null centered on a nearby star at a distance of say 10 parsecs. A large planet ('Jupiter') would have an angular separation from the star of about 0.5 arcsec. To have a fringe crest on the planet, a fringe period of 1.0 arcsec is needed and at 40 microns the required baseline is 8 m. Spinning the interferometer about the line of sight to the star results, even with pointing errors, in a relatively slowly varying but strongly suppressed stellar output and a more rapidly varying fringe-like planetary signal rich in higher harmonics. For pointing errors up to .050 arcsec the planet's fourth harmonic greatly exceeds that from the star, thereby relaxing interferometer pointing tolerances. Indeed, it appears that the limiting factor is zodiacal infrared background radiation and not the intense localized stellar flux which can effectively be eliminated by the fringe null of the spinning infrared interferometer.
    Keywords: ASTRONOMY
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Spectral analysis of the Elatina series (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The Elatina formation in South Australia, which provides a rich fossil record of presumptive solar activity in the late Precambrian, is of great potential significance for the physics of the sun because it contains luminae grouped in cycles of about 12, an appearance suggestive of the solar cycle. Here, the laminae are treated as varves laid down yearly and modulated in thickness in accordance with the late Precambrian sunspot activity for the year of deposition. The purpose is to present a simple structure, or intrinsic spectrum, that will be uncovered by appropriate data analysis.
    Keywords: GEOPHYSICS
    Type: Solar Physics (ISSN 0038-0938); 116; 1 19; 179-194
    Format: text
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    NASA TECHNICAL REPORTS
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