Total sunspot area before 1875 (reconstruction) |
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Authors: | A P Sarychev E M Roshchina |
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Institution: | (1) Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119992, Russia |
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Abstract: | 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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Keywords: | 96 60 qd |
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