tokens: We made use of observations from the AIA and HMI instruments on board the SDO mission (available at jsoc.stanford.edu ), the SILSO sunspot number record ( www.sidc.be/silso/ ), and the IUP Mg II index composite ( www.iup.uni-bremen.de/gome/gomemgii.html ). This study was supported by the German Federal Ministry of Education and Research under project 01LG1209A.
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