Title: Can stochastic resonance explain the amplification of planetary tidal forcing?
Authors : Albert, Carlo
Ulzega, Simone
et. al : No
Conference details: 4th Solar Dynamo Thinkshop, Rome, Italy, 25 - 26 November 2019
Issue Date: 2019
License (according to publishing contract) : Not specified
Type of review: Not specified
Language : English
Subject (DDC) : 500: Natural sciences and mathematics
Abstract: Repeated Grand Minima revealed by proxies of solar activity suggest that the Sun alternates between two stable states, a quiescent and an active one. If the intrinsic noise of the solar dynamo allows for a frequent switching between these stable states, a tiny periodic modulation of the corresponding transition probabilities can be greatly amplified – a phenomenon known as stochastic resonance. It is well-known that Babcock-Leighton-type dynamo models can be reduced to a stochastic iterative map model capable of capturing the essential low-frequency features of the solar dynamo mechanism. In such a simplified framework, we give numerical evidence that a tiny tidal modulation of the minimal magnetic field required for flux-tube buoyancy is greatly amplified by the dynamo, provided that it operates close enough to a critical bifurcation point. Inference with more refined dynamo models is required to test this “criticality hypothesis”.
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Applied Simulation (IAS)
Publication type: Conference other
URI: https://digitalcollection.zhaw.ch/handle/11475/18954
Published as part of the ZHAW project : BISTOM - Bayesian Inference with Stochastic Models
Appears in Collections:Publikationen Life Sciences und Facility Management

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