Stellar Magnetism in Natura and in Silico

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    • hochgeladen 22. Dezember 2023

    The Sun exhibits magnetic activity in various spatial and temporal scales. For a dynamo theorist the arguably
    most interesting phenomena is the on the average 22-year magnetic cycle of the Sun. Observations
    accumulated over several decades show that other low mass stars like the Sun also exhibit magnetic activity
    and cycles, with the level of magnetic activity being closely related to the age of the stars. I summarize the main
    findings from observations and how the Sun fits into this overall picture.
     
    Theoretical modeling of stellar magnetism relies heavily on numerical modeling. However, the physical
    conditions in such models are also far removed from real stars and making contact with observations has to be
    made with care. Nevertheless, 3D MHD simulations of convection and dynamos capture many characteristics
    of solar and stellar observations and they are the most promising way to understand the genesis of magnetism
    in stars. Recent simulation results of solar-like and fully convective stars are discussed, emphasizing the
    successes and outstanding challenges.

    Referent/in:

    Petri Käpylä


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