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Solar Physics

, Volume 255, Issue 1, pp 179–185 | Cite as

Correlation Function Analysis between Sunspot Cycle Amplitudes and Rise Times

  • Zhanle Du
  • Huaning Wang
  • Liyun Zhang
Article

Abstract

The running cross-correlation coefficient between solar-cycle amplitudes and rise times at a certain cycle lag is found to vary in time, when using the smoothed monthly-mean sunspot group numbers available for 1610 – 1995. It may be negative or positive for different periods of time. The Waldmeier effect (in which the rise times decrease with amplitude) is also found to be very weak for some cycles. This result represents an observational constraint on solar-dynamo models and can help us better understand the long-term evolution of solar activity.

Keywords

Sunspots, statistics Solar cycle, models 

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.National Astronomical ObservatoriesChinese Academy of SciencesBeijingChina

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