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Small-scale dynamos in simulations of stratified turbulent convection
Leibniz Inst Astrophys Potsdam, Sternwarte 16, D-11482 Potsdam, Germany.;Aalto Univ, Dept Comp Sci, ReSoLVE Ctr Excellence, Aalto, Finland.;Max Planck Inst Sonnensyst Forsch, Gottingen, Germany..
Aalto Univ, Dept Comp Sci, ReSoLVE Ctr Excellence, Aalto, Finland.;Max Planck Inst Sonnensyst Forsch, Gottingen, Germany..
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Stockholm, Sweden.;Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, Stockholm, Sweden.;Univ Colorado, JILA, Boulder, CO 80309 USA.;Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA.;Lab Atmospher & Space Phys, Boulder, CO USA..
2018 (English)In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 339, no 2-3, p. 127-133Article in journal (Refereed) Published
Abstract [en]

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 Rm(1/2) scaling. No evidence for a logarithmic increase of the growth rate with Rm is found.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 339, no 2-3, p. 127-133
Keywords [en]
convection, stars: magnetic fields, Sun: magnetic fields, turbulence
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-230856DOI: 10.1002/asna.201813477ISI: 000434059100002Scopus ID: 2-s2.0-85045898004OAI: oai:DiVA.org:kth-230856DiVA, id: diva2:1220099
Note

QC 20180618

Available from: 2018-06-18 Created: 2018-06-18 Last updated: 2018-06-18Bibliographically approved

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