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Source Citation
Willie Soon, Steven H. Yaskell, The Maunder Minimum and the Variable Sun-Earth Connection (London: World Scientific Publishing Company, 2003), 90-92.
G.S. Lakhina, et al, "Research on Historical Records of Geomagnetic Storms," Coronal and Stellar Mass Ejections: Proceedings of the 226th Symposium of the International Astronomical Union Held in Beijing, China, September 13-17, 2004 (Cambridge: Cambridge University Press, 2004), 4-6.
G.S. Lakhina, et al, "Research on Historical Records of Geomagnetic Storms," Coronal and Stellar Mass Ejections: Proceedings of the 226th Symposium of the International Astronomical Union Held in Beijing, China, September 13-17, 2004 (Cambridge: Cambridge University Press, 2004), 4-6.