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  • SOLAR PHYSICS  (2)
  • LUNAR AND PLANETARY EXPLORATION  (1)
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  • 1
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    The solar cycle - A central-source wave theory (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Studies stimulated by the interpretation of the Elatina formation in South Australia as a fossil record of solar activity have led to discoveries of previously unnoticed features of the sunspot cycle record and to a theory of origin of the sunspot cycle that postulates a solar core in torsional motion and a magnetomechanical wave that couples to the photosphere. The considerations supporting the solar interpretation of the Elatina formation are gathered together.
    Keywords: SOLAR PHYSICS
    Type: Astronomical Society of Australia, Proceedings (ISSN 0066-9997); 8; 2, 19; 145-147
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Searching for nonsolar planets (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The use of infrared techniques to search for nonsolar planets is examined and compared with other possible methods. Long focus astrometry, spectroscopic radial velocity measurements and spaceborne apodization all use visible light and need further refinement to be practical. Infrared offers an advantage of about 10 to the 5th over visible light as regards the ratio of power received from star and planet. Long baseline infrared interferometry from earth orbit could place an interferometric null on the star to enhance planetary radiation and a spinning interferometer would modulate planetary emission to permit synchronous detection; such an interferometer is illustrated. The limit to sensitivity would be set by thermal radiation to the detector and the infrared component of zodiacal light.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 38; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Three-halves law in sunspot cycle shape (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Evidence is provided of a nonlinear effect consisting of a 3/2 power law in annual mean sunspot numbers since 1700. With correction for this nonlinearity, it has been possible to reproduce theoretically the well-known Waldmeier relation between rise time and maximum sunspot number, in addition to other features of the 11 yr sunspot curve such as a break in the decline of strong 11 yr cycles. Eighteenth century sunspot numbers are found to fit theoretical semicycle shapes well. The present model suggests an upward travelling 22 yr wave launched by a reciprocating magnetic oscillator deep in the sun.
    Keywords: SOLAR PHYSICS
    Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 230; 535-550
    Format: text
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    NASA TECHNICAL REPORTS
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