Solar UV Spectral Irradiance Variation During Solar Cycle 23

Details Solar UV Spectral Irradiance Variation During Solar Cycle 23 Solar UV Spectral Irradiance Variation During Solar Cycle 23

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.a51e0087f&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #A51E-0087

Physics

0342 Middle Atmosphere: Energy Deposition, 1610 Atmosphere (0315, 0325), 1650 Solar Variability

Scientific paper

The Solar Ultraviolet Spectral Irradiance Monitor (SUSIM) aboard the UARS has measured the solar spectral irradiance at UV wavelengths in the 115-410 nm range since October 1991. This period extends from a secondary maximum of solar activity before the decline of solar cycle~22, through the intervening solar minimum, and through the solar cycle~23 maximum. Accordingly, SUSIM has observed nearly the entire UV variation of both solar cycles. SUSIM uses deuterium lamps and redundant optical channels to determine changes in its responsivity since its final ground calibration more than ten years before the latest measurements. The new results for the wavelength-dependent variation of the solar UV spectral irradiance during solar cycle~23 will be presented. Trends in solar irradiance and in possible error sources are identified and analyzed. Emphasis will be placed on comparisons with variations observed during solar cycle~22 and on their relationship with solar indices (such as the MgII core-to-wing ratio). The rationale for continuing redundant and overlapping measurements of the solar UV irradiance will be provided. >http://wwwsolar.nrl.navy.mil/susim_uars.html

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