Earth, Planets and Space

, Volume 56, Issue 5, pp e13–e16 | Cite as

Nonlinear variability of SYM-H over two solar cycles

  • J. A. Wanliss
Open Access


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 


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Copyright information

© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2004

Authors and Affiliations

  1. 1.Department of Physical SciencesEmbry-Riddle Aeronautical UniversityDaytona BeachUSA

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