Solar Physics

, Volume 141, Issue 1, pp 199–202 | Cite as

Sunspot number time series: Exponential fitting and solar behavior

  • D. J. R. Nordemann


The annual mean sunspot number time series for the period 1700–1990 A.D. was examined for possible fitting with exponential functions of the form N=NO.exp(Kt) for each phase, where the values of K, analogous to probabilities, are positive for the rising phase and negative for the declining phase. The results obtained suggest the participation of physical processes following macroscopic laws similar to those of explosion or nuclear divergence for sunspot production and of nuclear decay for sunspot disappearance.


Time Series Physical Process Exponential Function Sunspot Number Number Time 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Kane, R. P. and Trivedi, N. B.:1991, Pageoph. 135, 463.Google Scholar
  2. MacDonald, G. J.:1989, Rev. Geophys. 27, 449.Google Scholar
  3. Mundt, M. D., Maguire II, W. B., and Chase, R. R. P.:1991, J. Geophys. Res. 96-A2, 1705.Google Scholar
  4. Pasricha, P. K., Aggarwal, S., and Reddy, M.:1991, Ann. Geophysicae, 9, 696.Google Scholar

Copyright information

© Kluwer Academic Publishers 1992

Authors and Affiliations

  • D. J. R. Nordemann
    • 1
  1. 1.National Institute for Space Research - INPESão José dos Campos, SPBrazil

Personalised recommendations