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  Small‐scale dynamos in simulations of stratified turbulent convection

Käpylä, P. J., Käpylä, M. J., & Brandenburg, A. (2018). Small‐scale dynamos in simulations of stratified turbulent convection. Astronomische Nachrichten, 339(2-3), 127-133. doi:10.1002/asna.201813477.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-502C-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-502D-1
Genre: Journal Article

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Käpylä, P. J.1, Author
Käpylä, Maarit J.1, Author              
Brandenburg, A., Author
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              

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 Abstract: Small‐scale dynamo action is often held responsible for the generation of quiet Sun magnetic fields. We aim to determine the excitation conditions and saturation level of small‐scale dynamos in nonrotating turbulent convection at low magnetic Prandtl numbers. We use high‐resolution direct numerical simulations of weakly stratified turbulent convection. We find that the critical magnetic Reynolds number for dynamo excitation increases as the magnetic Prandtl number is decreased, which might suggest that small‐scale dynamo action is not automatically evident in bodies with small magnetic Prandtl numbers, such as the Sun. As a function of the magnetic Reynolds number (Rm), the growth rate of the dynamo is consistent with an Rm1/2 scaling. No evidence for a logarithmic increase of the growth rate with Rm is found.

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Language(s): eng - English
 Dates: 2019-04-052018
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1002/asna.201813477
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Title: Astronomische Nachrichten
  Other : Astron. Nachr.
Source Genre: Journal
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Publ. Info: [S.l. : s.n.]
Pages: - Volume / Issue: 339 (2-3) Sequence Number: - Start / End Page: 127 - 133 Identifier: ISSN: 0004-6337
CoNE: https://pure.mpg.de/cone/journals/resource/954925382053