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Multifractal features of magnetospheric dynamics and their dependence on solar activity

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Abstract

In the present study, novel wavelet leaders (WL) based multifractal analysis has been used to get a better knowledge of the self-organization phenomena inherent in complex magnetospheric dynamics during disturbance and quiescent periods, focusing mainly on the intermittent features of auroral electrojet (AE) index. The results derived from the analysis certainly exhibit the phase transition property of magnetosphere system with respect to variabilities in the driving conditions. By using the novel WL method, solar activity dependence/independence of intermittency of magnetospheric proxies such as AE, SYM-H and Dst indices have been compared. The results indicate that the multifractality of AE index does not follow the solar activity cycle while intermittent features of SYM-H and Dst indices show high degree of solar activity dependence. This shows that along with the external solar wind perturbations, certain complex phenomena of internal origin also significantly modulate the dynamics of geomagnetic fluctuations in the auroral region.

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Acknowledgements

The author expresses sincere gratitude for the valuable comments and suggestions of the anonymous referee, which have led to significant improvement in the quality of the manuscript. The Author also thanks World Data Center for Geomagnetism, Kyoto, Japan for providing auroral index data and USGS for providing 1-min Dst data. The author also shows gratefulness towards Dr. Prince P.R, Assistant Professor, Govt. Arts College, Trivandrum for his support in the present work. The author also acknowledges JRF from University of Kerala, Trivandrum.

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Correspondence to Sumesh Gopinath.

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Gopinath, S. Multifractal features of magnetospheric dynamics and their dependence on solar activity. Astrophys Space Sci 361, 290 (2016). https://doi.org/10.1007/s10509-016-2870-5

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  • DOI: https://doi.org/10.1007/s10509-016-2870-5

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