The persistence of solar activity indicators and the descent of the Sun into Maunder Minimum conditions

Lockwood M, Owens MJ, Barnard L, Davis CJ & Steinhilber F
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Lockwood, M., Owens, M. J., Barnard, L., Davis, C. J., & Steinhilber, F. (2011). The persistence of solar activity indicators and the descent of the Sun into Maunder Minimum conditions. Geophysical Research Letters, 38(22), 1-5. https://doi.org/10.1029/2011GL049811