volume 13, issue S335, P211-215 2017
DOI: 10.1017/s1743921317010912
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V. V. Zharkova, S. J. Shepherd, E. Popova, S. I. Zharkov

Abstract: AbstractBy applying Principal Components Analysis (PCA) to solar magnetic synoptic maps in cycle 21-23 obtained with Wilcox Solar Observatory we derived analytical expressions for two principal components and their summary curve of solar magnetic field oscillations defined by dipole magnetic sources. In this paper we extrapolate backwards three millennia the summary curve describing solar activity and compare it with the relevant historic data. The extrapolated summary curve shows a remarkable resemblance to t…

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