Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh34b..08s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH34B-08
Astronomy and Astrophysics
Astrophysics
[7504] Solar Physics, Astrophysics, And Astronomy / Celestial Mechanics, [7536] Solar Physics, Astrophysics, And Astronomy / Solar Activity Cycle, [7537] Solar Physics, Astrophysics, And Astronomy / Solar And Stellar Variability
Scientific paper
When Rudolf Wolf devised the sunspot number he noted [1859] that the length of the cycle was close to the orbital period of Jupiter. He even constructed a formula involving the periods of Jupiter, Saturn, Venus, and Earth that reproduced the sunspot numbers 1826-1848. Unfortunately the formula failed for subsequent cycles and Wolf concluded at the end of his life that the attempts by himself and others to 'explain' solar activity by planetary influences had really never yielded any satisfactory result. Nevertheless, the hypothesis rears it head from time to time, even today. I review several recent attempts, both proposed correlations and mechanisms. The recent discovery of exoplanets and the possibility of detecting magnetic cycles on their host stars offers a near future test of the hypothesis, based on more than the one exemplar, the solar system, we have had until now..
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