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Magnetic Helicity from Multipolar Regions on the Solar Surface
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi. University of Colorado, USA.ORCID-id: 0000-0002-7304-021X
Rekke forfattare: 22018 (engelsk)Inngår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 869, nr 1, artikkel-id 3Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The emergence of dipolar magnetic features on the solar surface is an idealization. Most of the magnetic flux emergence occurs in complex multipolar regions. Here, we show that the surface pattern of magnetic structures alone can reveal the sign of the underlying magnetic helicity in the nearly force-free coronal regions above. The sign of the magnetic helicity can be predicted to good accuracy by considering the three-dimensional position vectors of three spots on the sphere ordered by their relative strengths at the surface and compute from them the skew product. This product, which is a pseudoscalar, is shown to be a good proxy for the sign of the coronal magnetic helicity.

sted, utgiver, år, opplag, sider
2018. Vol. 869, nr 1, artikkel-id 3
Emneord [en]
dynamo, magnetohydrodynamics (MHD), methods: numerical, Sun: corona, Sun: magnetic fields, turbulence
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-163694DOI: 10.3847/1538-4357/aae97fISI: 000452440000003OAI: oai:DiVA.org:su-163694DiVA, id: diva2:1280266
Tilgjengelig fra: 2019-01-18 Laget: 2019-01-18 Sist oppdatert: 2022-02-26bibliografisk kontrollert

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