Comparison of the extended solar minimum of 2006-2009 with the Spoerer, Maunder, and Dalton Grand Minima in solar activity in the past

McCracken KG & Beer J
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McCracken, K. G., & Beer, J. (2014). Comparison of the extended solar minimum of 2006-2009 with the Spoerer, Maunder, and Dalton Grand Minima in solar activity in the past. Journal of Geophysical Research A: Space Physics, 119(4), 2379-2387. https://doi.org/10.1002/2013JA019504