Long-term persistence of solar activity |
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Authors: | Alexander Ruzmaikin Joan Feynman Paul Robinson |
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Institution: | (1) Department of Physics and Astronomy, California State University, 91330 Northridge, CA, USA;(2) Jet Propulsion Laboratory, California Institute of Technology, 91109 Pasadena, CA, USA |
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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. |
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