Periodicities in the sunspot cycle
β Scribed by P.A.M. Berry
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 697 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0083-6656
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## Abstract It has been pointed out previously that treeβring series from Formosa show an 11βyear periodicity related to the sunspot cycle. However, significance tests of this finding have not been made and therefore the statistical reliability has not been known. Spectra of treeβring series from o
The sunspot record for the time interval 1749-1977 can be represented conveniently by an harmonic model comprising a relatively large number of lines. Solar activity can otherwise be considered as a sequence of partly overlapping events, triggered periodically at intervals of the order of 11 years.