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The Global Solar Dynamo
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2016 (English)In: Space Science Reviews, ISSN 0038-6308, E-ISSN 1572-9672, 1-29 p.Article in journal (Refereed) PublishedText
Abstract [en]

A brief summary of the various observations and constraints that underlie solar dynamo research are presented. The arguments that indicate that the solar dynamo is an alpha-omega dynamo of the Babcock-Leighton type are then shortly reviewed. The main open questions that remain are concerned with the subsurface dynamics, including why sunspots emerge at preferred latitudes as seen in the familiar butterfly wings, why the cycle is about 11 years long, and why the sunspot groups emerge tilted with respect to the equator (Joy’s law). Next, we turn to magnetic helicity, whose conservation property has been identified with the decline of large-scale magnetic fields found in direct numerical simulations at large magnetic Reynolds numbers. However, magnetic helicity fluxes through the solar surface can alleviate this problem and connect theory with observations, as will be discussed.

Place, publisher, year, edition, pages
Springer Netherlands, 2016. 1-29 p.
Keyword [en]
Solar dynamo, Sun, Magnetism, Reynolds number, Butterfly wings, Conservation properties, Magnetic helicity, Magnetic Reynolds number, Solar surfaces, Interactive devices
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-188253DOI: 10.1007/s11214-015-0230-3ScopusID: 2-s2.0-84957676641OAI: diva2:935870

QC 20160613

Available from: 2016-06-13 Created: 2016-06-09 Last updated: 2016-06-13Bibliographically approved

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Brandenburg, Axel
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