Total sunspot area before 1875 (reconstruction)

Details Total sunspot area before 1875 (reconstruction) Total sunspot area before 1875 (reconstruction)

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sosyr..41..256s&link_type=abstract

Solar System Research, Volume 41, Issue 3, pp.256-263

Physics

96.60.Qd

Scientific paper

Empirical functions approximating the dependences of total sunspot area A on relative sunspot number W and group sunspot number GN have been found. In the function A(W), allowance for its dependence on the secular activity cycle has been made; it is shown that this allowance is not needed for the function A(GN). The yearly mean A for 1700 1874 have been reconstructed using these functions and the available W and GN time series. Having supplemented the original data with archival observations, we have been able to reconstruct the monthly mean A W since 1821. We discuss the causes of the systematic difference between the reconstructions using W and GN.

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