Hysteresis in a Solar Activity Cycle

Details Hysteresis in a Solar Activity Cycle Hysteresis in a Solar Activity Cycle

2011-12-22

arxiv.org/abs/1112.5236v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

10 pages, 5 figures; Solar Physics, 2011

Scientific paper

10.1007/s11207-011-9889-0

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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