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Solar Physics

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

Long-term persistence of solar activity

  • Alexander Ruzmaikin
  • Joan Feynman
  • Paul Robinson
Article

Abstract

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.

Keywords

Time Series Solar Activity Random Process Periodic Variation Interval Length 
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.

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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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