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  • SOLAR PHYSICS  (3)
  • 1990-1994  (3)
  • 1
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    Wavelength Dependence of Solar Rotation and Solar Cycle UV Irradiance Variations (1990)
    In:  CASI
    Details
    Publication Date: 2014-09-23
    Description: It is shown that for the 5-year period 1982 to 1987 the solar irradiance decrease is estimated to be about 5 to 7 percent over the spectral interval 195 to 225 nm. This change becomes progressively smaller with increasing wavelength. For the 2-1/3 year period, January 1987 to April 1989, the irradiance increases about 6 percent at 195 to 205 nm and about 2 percent between 215 to 250 nm. Both 27-day and 13.5-day relative amplitudes peak at the time near solar maximum (1982) but remain comparatively small between 1983 and the onset of solar cycle 22. An average 280 day oscillation is noted for wavelengths up to 230 nm. No physical mechanism is offered for this variation.
    Keywords: SOLAR PHYSICS
    Type: NASA, Goddard Space Flight Center, Climate Impact of Solar Variability; p 323-327
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Modeling Solar Lyman Alpha Irradiance (1990)
    In:  CASI
    Details
    Publication Date: 2014-09-23
    Description: Solar Lyman alpha irradiance is estimated from various solar indices using linear regression analyses. Models developed with multiple linear regression analysis, including daily values and 81-day running means of solar indices, predict reasonably well both the short- and long-term variations observed in Lyman alpha. It is shown that the full disk equivalent width of the He line at 1083 nm offers the best proxy for Lyman alpha, and that the total irradiance corrected for sunspot effect also has a high correlation with Lyman alpha.
    Keywords: SOLAR PHYSICS
    Type: NASA, Goddard Space Flight Center, Climate Impact of Solar Variability; p 189-196
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Time variations of solar UV irradiance as measured by the SOLSTICE (UARS) instrument (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An analysis is presented of solar ultraviolet irradiance measurements made by the SOLSTICE spectrometers on the Upper Atmosphere Research Satellite (UARS). Reported observations cover the wavelength interval 119-420 nm, and the analysis discussed here is for the time period 26 Nov 1991 to 31 Dec 1992, during which time solar activity decreased in intensity. At the time of peak activity, the average 27-day variation had a relative amplitude of about 8 percent at Ly-alpha, tailing off to about 0.6 percent at 260 nm. It is shown that over the spectral interval 119-260 nm, the relative 27-day harmonic was about a factor of two larger during the strongly disturbed as compared with the moderately disturbed period.
    Keywords: SOLAR PHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 20; 12; p. 1315-1318.
    Format: text
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    NASA TECHNICAL REPORTS
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