Solar spectral irradiance and total solar irradiance at a solar minimum
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Results are presented for a wavelet analysis of solar spectral irradiance (SSI) in the ultraviolet to infrared range and total solar irradiance (TSI). The study is based on data collected by the Solar Radiation and Climate Experiment (SORCE) satellite from March 10, 2007 to January 23, 2010. Cross-wavelet analysis finds relationships of varying degrees of tightness between SSI, TSI, and magnetic flux in a sunspot zone on the surface rotation timescales of solar activity complexes. Wavelet coherence shows how magnetic flux variations within a latitudinal sunspot zone are related with spectral irradiance variations. For example, variations in ultraviolet radiation at UV 200.5 nm are in phase with those of the magnetic flux associated with solar activity complexes. However, there is an unusual interval UV 310 to 380 nm, in which coherent structures disappear and UV radiation variations do not follow the changes in the magnetic flux.
KeywordsMagnetic Flux Solar Minimum Total Solar Irradiance Carrington Rotation Wavelet Coherence
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- Haberreiter, M., Mechanisms for total and spectral solar irradiance variations, Proc. 264th IAU Symp. on Solar and Stellar Variability: Impact on Earth and Planets (Rio de Janeiro, Brazil, 2009), Kosovichev, A.G., Andrei, A.H., and Rozelot, J.-P., Eds., Cambridge Univ. Press, 2010, pp. 231–240.Google Scholar
- Kopp, G. and Lean, J.L., Lower value of total solar irradiance: evidence and climate significance, Geophys. Res. Lett., 2011, vol. 38, no. 1. Article ID L01706.Google Scholar
- Woods, T.N., Irradiance variations during this solar cycle minimum, Proc. ASP Workshop SOHO-23: Understanding a Peculiar Solar Minimum (Main, USA, 2009), Cranmer, S., Hoeksema, T., and Kohl, J., Eds., ASP, 2010, vol. 428, pp. 63–70.Google Scholar