Fig. 3
Relative number of magnetogram pixels of synoptic charts. Lines from top to bottom are pixel numbers of CRs 1982 (October 2001, solar maximum), 1926 (August 1997, similar to CR 2093), 2093 (February 2010) 1912 (July 1996, solar minimum), and 2087 (August 2009, lowest values in solar minimum 2009)0. Only pixels with magnetic field strengths above the noise threshold at B/μ = 50 G (marked with vertical line) are considered to obtain filling factors. a) B/μ: 0−100 G, b) B/μ: 0–1000 G.
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