Solar Cycle UV Irradiance Variation During Cycles 22 and 23

Details Solar Cycle UV Irradiance Variation During Cycles 22 and 23 Solar Cycle UV Irradiance Variation During Cycles 22 and 23

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh11a0378f&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH11A-0378

Other

1225 Global Change From Geodesy (1222, 1622, 1630, 1641, 1645, 4556), 1650 Solar Variability (7537), 7538 Solar Irradiance, 7549 Ultraviolet Emissions, 7594 Instruments And Techniques

Scientific paper

The Solar Ultraviolet Spectral Irradiance Monitor (SUSIM) aboard the Upper Atmosphere Research Satellite (UARS) measured the solar UV spectral irradiance in the 115--410~nm wavelength range between the years 1991 and 2005. This time period begins near to the peak of solar cycle (SC) 22 continues through the ensuing activity minimum and beyond the SC~23 maximum. SUSIM is self-calibrated through a combination of scans of four onboard stable deuterium lamps and less frequently used reference channels. Calibrated UV spectral irradiances over the entire SUSIM time period have recently become available. Two dominant periodicities dominate the time series variations, that of the solar cycle and solar rotation. The SC modulation of the UV irradiance is estimated based on the calibrated data up to about 290~nm above which calibration uncertainties exceed the measured variation. A different method is used to estimate the SC variation in this Near UV region based on signal detection. Time series of UV irradiance measurements from a single optical channel not corrected for instrument responsivity are analyzed to determine the strength of the solar activity signal as represented by the MgII core-to-wing ratio index. This and SC variation of the MgII index over the SC provides estimates for the SC modulation of the solar UV irradiance for UV wavelengths up to 400~nm. Results for SC modulation based on data for the 1991--1994 period show good agreement with the calibrated measurement for wavelengths up to 290 nm and are in agreement with results from other experiments. In the NUV where the UV irradiance is more intense, the SC modulation is substantially higher than earlier estimates. The total solar irradiance (TSI) is known to vary by about 0.1% over the SC. The UV portion of the SC variation of TSI based on these SUSIM estimates is 57% which is approximately twice that of earlier estimates.

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