Open Access

Nonlinear variability of SYM-H over two solar cycles

Earth, Planets and Space201456:BF03352507

https://doi.org/10.1186/BF03352507

Received: 31 March 2004

Accepted: 7 June 2004

Published: 24 June 2014

Abstract

Fractal fluctuation analysis is applied to ground-based SYM-H data during quiet times and during magnetic storm times spanning two solar cycles between 1981–2002. On the basis of Kp, intervals were selected that corresponded to quiet and active magnetospheric dynamics. A nonlinear detrended fluctuation analysis (DFA) was applied to monitor nonlinear variability over the solar cycles. We find significant variations in nonlinear statistics between quiet and active intervals, which indicates a difference in statistical variability for quiet times, and storm times.

Key words

SYM-H fractals nonlinear space weather indices geomagnetism Dst prediction