NPG Nonlinear Processes in Geophysics NPG Nonlin. Processes Geophys. 1607-7946 Copernicus Publications Göttingen, Germany 10.5194/npg-18-719-2011 Extreme events and long-range correlations in space weather Sharma A. S. 1 Veeramani T. 1 2 Department of Astronomy, University of Maryland, College Park, Maryland, 20742, USA now at: Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, India 20 10 2011 18 5 719 725 Copyright: © 2011 A. S. Sharma 2011 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://npg.copernicus.org/articles/18/719/2011/npg-18-719-2011.html The full text article is available as a PDF file from https://npg.copernicus.org/articles/18/719/2011/npg-18-719-2011.pdf

Space weather is driven by the solar wind and many geospace storms and substorms are natural hazards with considerable societal impact. The dynamical and statistical features of these events are complicated because of the turbulent nature of their driver, the solar wind. Large-scale data sets of geospace storms and substorms are analysed for this study of the inherent statistical characteristics of extreme events in geospace. The detrended fluctuation analysis, based on the autocorrelation functions, is used and yields scaling behavior representing long-term correlations. The scaling function is represented by two exponents, arising due mainly to the presence of the largely coherent internal dynamics of the magnetosphere and the turbulent nature of the solar wind driver.

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