The Waldmeier Effect: An Artifact of the Definition of Wolf Sunspot Number?

Details The Waldmeier Effect: An Artifact of the Definition of Wolf Sunspot Number? The Waldmeier Effect: An Artifact of the Definition of Wolf Sunspot Number?

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...673l..99d&link_type=abstract

The Astrophysical Journal, Volume 673, Issue 1, pp. L99-L101.

Astronomy and Astrophysics

Astronomy

14

Sun: Activity, Sun: Magnetic Fields, Sun: Photosphere

Scientific paper

We show that the well-known ``Waldmeier effect,'' or anticorrelation between the peak in sunspot number of a cycle and the time from minimum to reach that peak, is not present in sunspot area data averaged in the same way. With a 13-rotation Gaussian running average applied to both sunspot number and sunspot area, we find the correlation between cycle rise time and cycle peak is r=-0.71 for sunspot number and r=10-4 for sunspot area. Hathaway et al. previously showed that the Waldmeier effect is much weaker (r=-0.34) in sunspot group number. Thus the Waldmeier effect may be specific to only Wolf sunspot number.

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