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Understanding the origin of turbulent fluctuations is crucial for fusion devices. Anomalous diffusion has been a challenging topic for a long time. In the last decade, a new idea come out suggesting that anomalous diffusion behaves like self-organized critical (SOC) systems leading to avalanches which drives particles out of the confinement region by radial convection. It was suggested characterize the SOC process by using the Hurst parameter, H, resulting from R/S scaling. It was argued that the fact that H > 0.5 means long-time correlation and thus is a strong indication of SOC behaviour. Such conclusion, that is to interpret the H > 0.5 is caused by long-time correlation, was shown to be incorrect in a previous article. The present article is a reply to comments on the previous paper, and aims at giving some details on the meaning of the H parameter and on the way it is determined.

Additional information

Authors: WANG G D, West Virginia University, Department of Physics, Morgantown, West Virginia (US);DEVYNCK P, DRFC, CEA Cadarache, St-Paul-Lez-Durance (FR);ANTAR G, University of California, Fusion Energy Research Program, San Diego, California (US)
Bibliographic Reference: An article published in: Physics of Plasma, Vol.7, No 12 (2000), pp.5269-5271
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