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Magnetic helicity and fluxes in an inhomogeneous alpha(2) dynamo
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, KTH Royal Inst Technol, NORDITA, Stockholm, Sweden..ORCID iD: 0000-0002-7304-021X
2018 (English)In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 339, no 9-10, p. 631-640Article in journal (Refereed) Published
Abstract [en]

Much work on turbulent three-dimensional dynamos has been done using triply periodic domains, in which there are no magnetic helicity fluxes. Here, we present simulations where the turbulent intensity is still nearly homogeneous, but now there is a perfect conductor boundary condition on one end and a vertical field or pseudovacuum conditions on the other. This leads to migratory dynamo waves. Good agreement with a corresponding analytically solvable alpha(2) dynamo is found. Magnetic helicity fluxes are studied in both types of models. It is found that at moderate magnetic Reynolds numbers, most of the magnetic helicity losses occur on large scales. Whether this changes at even larger magnetic Reynolds numbers, as required for alleviating the catastrophic dynamo quenching problem, remains stillunclear.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2018. Vol. 339, no 9-10, p. 631-640
Keywords [en]
magnetic fields, magnetohydrodynamics, turbulence
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-245964DOI: 10.1002/asna.201913604ISI: 000458954200001Scopus ID: 2-s2.0-85061672012OAI: oai:DiVA.org:kth-245964DiVA, id: diva2:1295555
Note

QC 20190312

Available from: 2019-03-12 Created: 2019-03-12 Last updated: 2019-03-12Bibliographically approved

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Brandenburg, Axel

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