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Nature 436, E4-E5 (28 July 2005) | doi:10.1038/nature04046; Published online 27 July 2005

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Climate:  How unusual is today's solar activity? (reply)

S. K. Solanki1, I. G. Usoskin2, B. Kromer3, M. Schüssler1 & J. Beer4

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Muscheler et al.1 claim that the solar activity affecting cosmic rays was much higher in the past than we deduced2 from 14C measurements. However, this claim is based on a problematic normalization and is in conflict with independent results, such as the 44Ti activity in meteorites and the 10Be concentration in ice cores.

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