http://arxiv.org/abs/2105.06519
The aim of this work is to create a long (410 years) series of average annual total sunspot areas AR – physically-based index of sunspot activity. We used telescopic observations of the AR index in 1832-1868 and 1875-2020, as well as the relationship between AR and long series of sunspot indices SN (ISN version 2.0) and sunspot groups GN (Svalgaard and Schatten (2016) GSN version). The Royal Greenwich observatory series after 1976 is extended by the Kislovodsk Mountain Astronomical Station data. When reconstructing AR from SN, it is taken into account that the function AR = f (SN) has a nonlinear systematic character and uncertainty associated with the heterogeneity of these indices. Therefore, in addition to modeling the most probable AR values, predictive limits of reconstruction uncertainty are determined. In the interval 1610-1699 the reconstruction we carried out on the basis of the GN series using the previously proposed decomposition in pseudo-phase space method (DPS). The resulting series NO21y is freely available online. We show that for this series the empirical Gnevyshev-Ohl rule and Waldmeier effect are fulfilled. Wavelet analysis reveals periodicities of 8.4-13.8 years for the main cycle (with a sharp decrease of the period before the global Maunder and Dalton minima) and a two-component Gleissberg cycle with typical periods of 50-60 years and 90-110 years.
Y. Nagovitsyn and A. Osipova
Mon, 17 May 21
34/55
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