| Issue |
EPL
Volume 148, Number 2, October 2024
|
|
|---|---|---|
| Article Number | 23001 | |
| Number of page(s) | 6 | |
| Section | Fluid and nonlinear dynamics | |
| DOI | https://doi.org/10.1209/0295-5075/ad7f85 | |
| Published online | 14 October 2024 | |
Bistability in the sunspot cycle
1 Institut National de Recherche en Sciences et Technologies du Numérique (INRIA) - Lille, France
2 Courant Institute of Mathematical Sciences, New York University - New York, NY, USA
Received: 4 July 2024
Accepted: 25 September 2024
A direct dynamical test of the sunspot cycle is carried out to indicate that a stochastically forced nonlinear oscillator characterizes its dynamics. The sunspot series is then decomposed into its eigen time-delay coordinates. The relevant analysis reveals that the sunspot series exhibits bistability, with the possibility of modeling the solar cycle as a stochastically and periodically forced bistable oscillator, accounting for poloidal and toroidal modes of the solar magnetic field. Such a representation enables us to conjecture stochastic resonance as the key mechanism in amplifying the planetary influence on the Sun, and that extreme events, due to turbulent convection noise inside the Sun, dictate crucial phases of the sunspot cycle, such as the Maunder minimum.
© 2024 EPLA
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