Sunspot numbers


This dataset provides measurements of the number of sunspots, magnetic active regions, seen each month on the Sun from 1749 until May 2014. It shows the well-known 11-year solar magnetic cycle as well as other variations. The dataset is described in Appendix C.13 of Feigelson & Babu (2012) and is obtained from the Solar Physics research group at NASA's Marchall Space Flight Center The dataset has four columns: Year, Month, Monthly average sunspot number (SSN), and its standard deviation from the International Sunspot Number compiled by the Solar Influences Data Analysis Center in Belgium Users are encouraged to retrieve updated versions prior to study. The dataset is useful for the analysis of periodic and aperiodic time series.




A table containing 3185 rows and 4 columns.


Feigelson and Babu (2012)


Feigelson, E. D. and Babu, G. J. (2012) Modern Statistical Methods for Astronomy with R Applications, Cambridge UK:Cambridge University Press

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