Sun's retrograde motion and violation of even-odd cycle rule in sunspot activity

  title={Sun's retrograde motion and violation of even-odd cycle rule in sunspot activity},
  author={J. Javaraiah},
  journal={Monthly Notices of the Royal Astronomical Society},
  • J. Javaraiah
  • Published 12 July 2005
  • Physics
  • Monthly Notices of the Royal Astronomical Society
The sum of sunspot numbers over an odd-numbered 11-yr sunspot cycle exceeds that of its preceding even-numbered cycle, and it is well known as Gnevyshev and Oh1 rule (or G-O rule) after the names of the authors who discovered it in 1948. The G-O rule can be used to predict the sum of sunspot numbers of a forthcoming odd cycle from that of its preceding even cycle. However, this is not always possible because occasionally the G-O rule is violated. So far, no plausible reason is known either for… 

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