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Magnetic helicity and fluxes in an inhomogeneous alpha(2) dynamo
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi. University of Colorado, USA; Carnegie Mellon University, USA.ORCID-id: 0000-0002-7304-021X
Rekke forfattare: 12018 (engelsk)Inngår i: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 339, nr 9-10, s. 631-640Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2018. Vol. 339, nr 9-10, s. 631-640
Emneord [en]
magnetic fields, magnetohydrodynamics, turbulence
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-166585DOI: 10.1002/asna.201913604ISI: 000458954200001OAI: oai:DiVA.org:su-166585DiVA, id: diva2:1293394
Tilgjengelig fra: 2019-03-04 Laget: 2019-03-04 Sist oppdatert: 2019-12-12bibliografisk kontrollert

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