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Magnetic Helicity Reversal in the Corona at Small Plasma Beta
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Max-Planck-Institut für Sonnensystemforschung, Germany.
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: 32018 (engelsk)Inngår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 869, nr 1, artikkel-id 2Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Solar and stellar dynamos shed small-scale and large-scale magnetic helicity of opposite signs. However, solar wind observations and simulations have shown that some distance above the dynamo both the small-scale and large-scale magnetic helicities have reversed signs. With realistic simulations of the solar corona above an active region now being available, we have access to the magnetic field and current density along coronal loops. We show that a sign reversal in the horizontal averages of the magnetic helicity occurs when the local maximum of the plasma beta drops below unity and the field becomes nearly fully force free. Hence, this reversal is expected to occur well within the solar corona and would not directly be accessible to in situ measurements with the Parker Solar Probe or SolarOrbiter. We also show that the reversal is associated with subtle changes in the relative dominance of structures with positive and negative magnetic helicity.

sted, utgiver, år, opplag, sider
2018. Vol. 869, nr 1, artikkel-id 2
Emneord [en]
dynamo, magnetohydrodynamics (MHD), methods: numerical, Sun: corona, Sun: magnetic fields, solar wind
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-163693DOI: 10.3847/1538-4357/aae97aISI: 000452440000002OAI: oai:DiVA.org:su-163693DiVA, id: diva2:1280271
Tilgjengelig fra: 2019-01-18 Laget: 2019-01-18 Sist oppdatert: 2022-02-26bibliografisk kontrollert

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Singh, Nishant K.Brandenburg, Axel

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