Presents a normalized signed area statistic with Monte Carlo uncertainty propagation and surrogate-based significance testing for detecting hysteresis loops in ordered 2D spectral parameter trajectories.
Hysteresis in a Solar Activity Cycle
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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.
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2026 1verdicts
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A statistically robust framework for detecting and classifying hysteresis patterns in astrophysical spectral evolution
Presents a normalized signed area statistic with Monte Carlo uncertainty propagation and surrogate-based significance testing for detecting hysteresis loops in ordered 2D spectral parameter trajectories.