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Reinforcing a Double Dynamo Model with Solar-Terrestrial Activity in the Past Three Millennia

Published online by Cambridge University Press:  24 July 2018

V. V. Zharkova ,
S. J. Shepherd ,
E. Popova  and
S. I. Zharkov
V. V. Zharkova
Affiliation:
Northumbria University, Faculty of Engineering and Environment, Newcastle upon Tyne, UK email: [email protected]
S. J. Shepherd
Affiliation:
School of Engineering, Bradford University, Bradford, UK email: [email protected]
E. Popova
Affiliation:
Moscow University, Skobeltsyn Institute of Nuclear Physics, Moscow 119991, Russia email: [email protected]
S. I. Zharkov
Affiliation:
Hull University, Department of Physics and Mathematics, Kingston upon Hull, UK email: [email protected]
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Abstract

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By 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 the sunspot and terrestrial activity reported in the past millennia: the Maunder Minimum (1645-1715), Wolf minimum (1200), Oort minimum (1010-1050), Homer minimum (800-900 BC), the medieval warm period (900-1200), the Roman warm period (400-10BC). We note that Sporer minimum (1460-1550) derived from the increased abundance of isotope Δ14C is likely produced by a strong increase of galactic cosmic rays caused by a supernova Vela Junior occurred in the Southern hemisphere.

Keywords

solar activitydynamogeoactivity
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S335: Space Weather of the Heliosphere: Processes and Forecasts , July 2017 , pp. 211 - 215
Copyright
Copyright © International Astronomical Union 2018 

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