Solar Activity in the Past: From Different Proxies to Combined Reconstruction

Details Solar Activity in the Past: From Different Proxies to Combined Reconstruction Solar Activity in the Past: From Different Proxies to Combined Reconstruction

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004soph..224...77m&link_type=abstract

Solar Physics, Volume 224, Issue 1-2, pp. 77-84

Physics

3

Scientific paper

Using proxy series that includes ancient observations of sunspots and auroras, concentrations of cosmogenic isotopes 14C and 10Be, we reconstruct sunspot activity level since 850 AD to the present. As a main reference index of solar activity we use the Wolf sunspot numbers, which, as we demonstrate, reflect true levels of the activity in the 18th and 19th centuries better than the Group sunspot numbers. We construct a set of linear and nonlinear inductive models, which are in a good agreement with each other and reproduce the known global solar activity extrema. According to our results, amplitudes of the global maxima are in intermediate positions in respect to estimations of other authors. It follows from our reconstructions that the global maximum of the 20th century is not much higher, if at all, than others.

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