Long-Term Solar Irradiance Variations Over Solar Cycles 21 to 23

Details Long-Term Solar Irradiance Variations Over Solar Cycles 21 to 23 Long-Term Solar Irradiance Variations Over Solar Cycles 21 to 23

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh11a0376p&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH11A-0376

Other

1650 Solar Variability (7537), 7524 Magnetic Fields, 7529 Photosphere, 7536 Solar Activity Cycle (2162), 7538 Solar Irradiance

Scientific paper

In this paper we present the work accomplished during the three years long LWS TR&T grant (NAG5-13513). As part of the work we addressed the following questions: (1) How does various total irradiance composites relate to each other? (2) How well various solar indices can be used as surrogates for solar irradiance variations? As part of the research under question (1) we have constructed a new composite using both the Nimbus-7 and ERBS/ERBE total irradiance measurements. While the PMOD composite has shown a symmetrical long-term total irradiance variations with the same maximum and minimum level over the last three consecutive solar cycles, the ACRIM composite has shown a slow 0.05% secular trend from the minimum of cycle~21 to the minimum of cycle~22. Our reconstruction indicates a much smaller trend (about half of the one shown by the ACRIM composite). Our results also show that the linear relation between solar variability, as represented by total irradiance variations, and solar activity, as represented by magnetic indices, breaks down during the maximum and minimum of solar cycles 23. While most of the magnetic indices showed that cycle 23 was a weak cycle, both total and UV irradiances reached as high maxima as during the previous strong cycles. Furthermore, we have found that during the declining portion of cycle 23, total irradiance already reached minimum activity levels, while surrogates used in the empirical models were still in their declining phase. Considering the lack of good surrogates and physical understanding of the underlying mechanisms of irradiance variations, we will address briefly the perspectives of future space-based irradiance experiments.

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