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Fig. 1


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(A–D) Time series of the annual HMF reconstructions from 1845–1983, derived from; 10Be concentrations, Bc1 (with impulsive enhancements), and Bc2 (with suppressed impulsive enhancements); geomagnetic observations, Bg; and sunspot observations, Br. Error bars are 1σ errors of the mean. The red squares in panel (A) mark years where Bc1 ≠ Bc2. (E) Kernel density estimates of the distributions of four different HMF reconstructions.

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