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Solar Physics

, Volume 198, Issue 1, pp 51–56 | Cite as

Persistent 22-year cycle in sunspot activity: Evidence for a relic solar magnetic field

  • K. Mursula
  • I.G. Usoskin
  • G.A. Kovaltsov
Article

Abstract

We use the recently presented group sunspot number series to show that a persistent 22-year cyclicity exists in sunspot activity throughout the entire period of about 400 years of direct sunspot observations. The amplitude of this cyclicity is about 10% of the present sunspot activity level. A 22-year cyclicity in sunspot activity is naturally produced by the 22-year magnetic polarity cycle in the presence of a relic dipole magnetic field. Accordingly, a persistent 22-year cyclicity in sunspot activity gives an evidence for the existence of such a relic magnetic field in the Sun. The stable phase and the roughly constant amplitude of this cyclicity during times of very different sunspot activity level strongly support this interpretation.

Keywords

Magnetic Field Sunspot Number Number Series Magnetic Polarity Constant Amplitude 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • K. Mursula
    • 1
  • I.G. Usoskin
    • 2
  • G.A. Kovaltsov
    • 3
  1. 1.Department of Physical SciencesUniversity of OuluFinland
  2. 2.Sodankylä Geophysical Observatory, Oulu UnitUniversity of OuluFinland
  3. 3.Ioffe Phys.-Techn. InstituteSt. PetersburgRussia

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