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Solar Physics

, Volume 224, Issue 1–2, pp 95–101 | Cite as

An Upper Limit on Sunspot Activity During the Maunder Minimum

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

Abstract

We have estimated the upper and lower limits of sunspot activity, in terms of active day fraction during the Maunder minimum (1645–1710), using raw information on individual daily observations (Hoyt and Schatten, 1998). Establishing the relation between the sunspot activity and active day fraction after 1850, we evaluate the upper limit of annual group sunspot number during the deep Maunder minimum (1645–1700) which does not exceed 4. The earlier finding of a dominant 22-year periodicity during the Maunder minimum is verified and shown to be robust. Also we confirm that the start of the Maunder minimum was very abrupt.

Keywords

Lower Limit Annual Group Sunspot Number Group Sunspot Daily Observation 
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

© Springer Science + Business Media, Inc. 2004

Authors and Affiliations

  1. 1.Ioffe Physical-Technical InstituteSt. PetersburgRussia
  2. 2.Sodankylä Geophysical Observatory (Oulu unit)University of OuluFinland
  3. 3.Department of Physical SciencesUniversity of OuluFinland

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