Contributed talk: 3D models of stellar magnetism: cyclic and non-cyclic dynamos

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• Antoine Strugarek (CEA/Saclay)
• Wednesday 30 November 2022, 11:15-11:45
• Seminar Room 1, Newton Institute.

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DY2W03 - Modeling, observing and understanding flows and magnetic fields in the Earth's core and in the Sun

The magnetic field of our Sun is generated through an internal dynamo process leading to a cyclic variability of about 11 years. This cyclic field shapes the environment of our star and determines the connectivity in the heliosphere from the photosphere to the Earth orbit and beyond. The Sun has probably not always possessed such a cyclic field, nor should it keep it as it ages. Indeed, stars like the Sun spin down as they age, which greatly influences the dynamo processes they are able to sustain.   I will present ongoing efforts to model stellar dynamos in an evolutionary context. Based on numerical studies, we have recently proposed a unified view of the types of cycles solar-like stars are able to sustain. These results are confirmed using both simplified, mean field approach as well as 3D turbulent numerical simulations using various approximations. They show a tight link between the large-scale rotation profile within solar-like star, and the type of cyclical dynamos they are able to sustain. In this context I will detail the expected energy budget of such stars, and its implication for stellar dynamos.  

This talk is part of the Isaac Newton Institute Seminar Series series.

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