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  • 1
    Electronic Resource
    Electronic Resource
    Solar Cycle 22 UV Spectral Irradiance Variability: Current Measurements by SUSIM UARS (1998)
    Springer
    Solar physics 177 (1998), S. 79-87 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Solar Ultraviolet Spectral Irradiance Monitor (SUSIM) has measured the solar spectral irradiance for wavelengths 115–410 nm on a daily basis since October 11, 1991. The absolutely calibrated solar UV irradiances through January 8, 1996 have been produced. Their time-dependent behavior is similar to that of the Mgii index as measured both by NOAA-9 SBUV and by SUSIM itself. The maximum long-term variation observed by SUSIM is at Lα and is measured to be in excess of a factor of 2. This maximum variation decreases with increasing wavelength until about 300 nm where no significant long-term variation is directly measured above SUSIM's estimated 1–2% relative accuracy. The wavelength dependence of the measured UV variability is found to roughly correspond to the mean emission height given by solar atmospheric radiative transfer models. Because SUSIM observations began when solar activity was near its peak and now extend to very near its minimum, estimates of the solar cycle 22 UV variability are generated from a combination of these measurements and solar activity proxy indices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004907902440
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A high precision Solar Ultraviolet Spectral Irradiance Monitor for the wavelength region 120–400 nm (1981)
    Springer
    Solar physics 74 (1981), S. 521-530 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract There exists a growing need to improve the accuracy of measurement of the absolute solar flux within the wavelength range 120–400 nm. Although full-disk solar fluxes and variations thereof in the 120–400 nm region are required to model the solar atmosphere, current increased interest in the measurements arises from their importance in modeling the terrestrial atmosphere. We describe the Solar Ultraviolet Spectral Irradiance Monitor (SUSIM) experiment under development at the Naval Research Laboratory (NRL) for flight aboard the Space Shuttle and the Upper Atmospheric Research Satellite (UARS). SUSIM will monitor the solar flux in the 120–400 nm region with high precision, using an in-flight calibration system to reduce absolute error to 〈 10%, and error relative to the 400 nm continuum to 〈 1%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154535
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    High spatial resolution photographs of the sun in Lα radiation (1973)
    Springer
    Solar physics 28 (1973), S. 35-42 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Photographs of the Sun in predominantly Lα radiation (centered at 1215.67 Å) with 3″ spatial resolution were taken from an Aerobee rocket shortly after fourth contact by the Moon on the eclipse day of 1972 July 10. This preliminary reporting of the results describes the instrument and shows two of the photographs taken. The supergranulation is manifest and active regions and filaments are well resolved over the entire disk. Densitometer traces across the disk are presented giving the flux incident on the Earth from active regions, cell boundaries, and filaments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152909
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    Paper (German National Licenses)
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