Temporal evolution of statistical features of the sunspot cycles |
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| Authors: | Maxim Ogurtsov Hogne Jungner |
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| Institution: | 1. Ioffe Physico-Technical Institute of Russian Academy of Sciences, 194 021, Polytechnicheskaya 26, Laboratory of Cosmic rays, St. Petersburg, Russia;2. Central Astronomical Observatory at Pulkovo, 196140, Pulkovskoje ave, 65/2, Laboratory of Space weather problems, St. Petersburg, Russia;3. The University of Helsinki, Dating Laboratory, P.O. Box 64, Gustaf Hällströminkatu 2, FI-00014, Helsinki, Finland |
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| Abstract: | Analysis of the general statistical features of the sunspot cycles in the period 1700–1996 AD, including the Gnevyshev–Ohl rule, Waldmeier rule and an amplitude–period effect, was performed for both Wolf numbers and group sunspot numbers. It was shown that for both solar indices all the statistical effects are weaker over the time interval 1700–1855 AD than over the time interval 1856–1996 AD. Possible causes of this difference are discussed. |
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| Keywords: | Solar variability Solar magnetic field |
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