Solar ultraviolet spectral-irradiance observations from the SUSIM-UARS experiment

The Solar Ultraviolet Spectral Irradiance Monitor (SUSIM) instrument on board the Upper Atmosphere Research Satellite (UARS) has measured solar ultraviolet spectral-irradiance values since October 1991. The calibration and tracking methods are described. The intensity values have a precision of 1% a...

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Bibliographic Details
Published in:Metrologia 1995-12, Vol.32 (6), p.661-665
Main Authors: Brueckner, G E, Floyd, L E, Lund, P A, Prinz, D K, VanHoosier, M E
Format: Article
Language:English
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Summary:The Solar Ultraviolet Spectral Irradiance Monitor (SUSIM) instrument on board the Upper Atmosphere Research Satellite (UARS) has measured solar ultraviolet spectral-irradiance values since October 1991. The calibration and tracking methods are described. The intensity values have a precision of 1% at wavelengths longer than 200 nm. Short-term ultraviolet (UV) variability is correlated with other chromospheric indices at wavelengths shorter than 280 nm. At longer wavelengths, this correlation changes gradually into an anticorrelation. There exists a long-term solar-cycle component at all wavelengths, which seems to be independent of the rotational modulation. The variability in the integrated UV from 110 nm to 300 nm amounts to 33% of the variability in the total solar irradiance.
ISSN:0026-1394
1681-7575
DOI:10.1088/0026-1394/32/6/53