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tokens: We would like to thank Tobias Wiengarten for assistance with the magnetic field data, as well as Malina Reytemeier, Paul Evenson and the entire IceCube collaboration, as well as members of the Ruhr Astroparticle Plasma Physics (RAPP) Center for helpful discussions on the subject. We are further grateful for the support from the BMBF (05A14PC1) and from MERCUR (St-2014-0040). This work utilizes data from the National Solar Observatory Integrated Synoptic Program, which is operated by the Association of Universities for Research in Astronomy, under a cooperative agreement with the National Science Foundation and with additional financial support from the National Oceanic and Atmospheric Administration, the National Aeronautics and Space Administration, and the United States Air Force. The GONG network of instruments is hosted by the Big Bear Solar Observatory, High Altitude Observatory, Learmonth Solar Observatory, Udaipur Solar Observatory, Instituto de Astrofísica de Canarias, and Cerro Tololo Interamerican Observatory.