Solar Physics

, Volume 276, Issue 1–2, pp 351–361 | Cite as

Distribution of the Daily Sunspot Number Variation for the Last 14 Solar Cycles

  • M.-I. PopEmail author


The difference between consecutive daily Sunspot Numbers was analysed. Its distribution was approximated on a large time scale with an exponential law. In order to verify this approximation a Maximum Entropy distribution was generated by a modified version of the Simulated Annealing algorithm. The exponential approximation holds for the generated distribution too. The exponential law is characteristic for time scales covering whole cycles, and it is mostly a characteristic of the Sunspot Number fluctuations and not of its average variation.


Solar cycle, models Sunspots, statistics 


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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Department of Electrical Engineering and Applied PhysicsTransilvania UniversityBrasovRomania

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