Hysteresis in a Solar Activity Cycle

Abstract

We analyze in situ measurements of solar wind velocity obtained by the Advanced Composition Explorer (ACE) spacecraft during the solar activity cycle 23. We calculated a robust complexity measure, the permutation entropy (S) of solar wind time series at different phases of a solar activity cycle. The permutation entropy measure is first tested on the known dynamical data before its application to solar wind time series. It is observed that complexity of solar wind velocity fluctuations at 1 AU shows hysteresis phenomenon while following the ascending and descending phases of the activity cycle. This indicates the presence of multistability in the dynamics governing the solar wind velocity over a solar activity cycle.

10 pages, 5 figures; Solar Physics, 2011

References in corpus (1)

• Reversal-Field Memory in the Hysteresis of Spin Glasses

Cited by in corpus (5)

• Permutation Entropy and Statistical Complexity Analysis of Turbulence in Laboratory Plasmas and the Solar Wind
• Visibility graph analysis of solar wind velocity
• Temporal Offsets between Maximum CME Speed Index and Solar, Geomagnetic, and Interplanetary Indicators during Solar Cycle 23 and the Ascending Phase of Cycle 24
• Temporal offsets among Solar activity indicators
• PECCARY: A novel approach for characterizing orbital complexity, stochasticity, and regularity