Small-Scale Dynamos : From Idealized Models to Solar and Stellar Applications

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A2 Katsausartikkeli tieteellisessä aikakauslehdessä
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Space Science Reviews, Volume 219, issue 5
In this article we review small-scale dynamo processes that are responsible for magnetic field generation on scales comparable to and smaller than the energy carrying scales of turbulence. We provide a review of critical observation of quiet Sun magnetism, which have provided strong support for the operation of a small-scale dynamo in the solar photosphere and convection zone. After a review of basic concepts we focus on numerical studies of kinematic growth and non-linear saturation in idealized setups, with special emphasis on the role of the magnetic Prandtl number for dynamo onset and saturation. Moving towards astrophysical applications we review convective dynamo setups that focus on the deep convection zone and the photospheres of solar-like stars. We review the critical ingredients for stellar convection setups and discuss their application to the Sun and solar-like stars including comparison against available observations.
Funding Information: MJKL acknowledges fruitful discussions with Dr. Jörn Warnecke and Dr. Thomas Hackman, and funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Project UniSDyn, grant agreement no 818665). LBR acknowledges financial support from the Spanish MICIN/AEI 10.13039/501100011033 through grants RTI2018-096886-B-C5, PID2021-125325OB-C5, and PCI2022-135009-2, co-funded by “ERDF A way of making Europe”, and through the “Center of Excellence Severo Ochoa” grant CEX2021-001131-S awarded to Instituto de Astrofísica de Andalucía. TB is grateful to Damein Przybylski for some great discussions on the role of magnetic fields in the solar chromosphere. This material is based upon work supported by the National Center for Atmospheric Research, which is a major facility sponsored by the National Science Foundation under Cooperative Agreement No. 1852977. MR received partial funding from NASA grant NNX17AI30G. | openaire: EC/H2020/818665/EU//UniSDyn
Convection, Cool stars, Quiet Sun, Small-scale dynamo, Stellar magnetism
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Rempel , M , Bhatia , T , Bellot Rubio , L & Korpi-Lagg , M J 2023 , ' Small-Scale Dynamos : From Idealized Models to Solar and Stellar Applications ' , Space Science Reviews , vol. 219 , no. 5 , 36 .