Solar Physics

, Volume 149, Issue 2, pp 395–403 | Cite as

Long-term persistence of solar activity

  • Alexander Ruzmaikin
  • Joan Feynman
  • Paul Robinson


We examine the question of whether or not the non-periodic variations in solar activity are caused by a white-noise, random process. The Hurst exponent, which characterizes the persistence of a time series, is evaluated for the series of14C data for the time interval from about 6000 BC to 1950 AD. We find a constant Hurst exponent, suggesting that solar activity in the frequency range from 100 to 3000 years includes an important continuum component in addition to the well-known periodic variations. The value we calculate,H ≈ 0.8, is significantly larger than the value of 0.5 that would correspond to variations produced by a white-noise process. This value is in good agreement with the results for the monthly sunspot data reported elsewhere, indicating that the physics that produces the continuum is a correlated random process and that it is the same type of process over a wide range of time interval lengths.


Time Series Solar Activity Random Process Periodic Variation Interval Length 
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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Alexander Ruzmaikin
    • 1
  • Joan Feynman
    • 2
  • Paul Robinson
    • 2
  1. 1.Department of Physics and AstronomyCalifornia State UniversityNorthridgeUSA
  2. 2.Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadenaUSA

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