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Compensating Faraday Depolarization by Magnetic Helicity in the Solar Corona
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi. Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). University of Colorado, USA.ORCID-id: 0000-0002-7304-021X
Rekke forfattare: 32017 (engelsk)Inngår i: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 845, nr 2, artikkel-id L15Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A turbulent dynamo in spherical geometry with an outer corona is simulated to study the sign of magnetic helicity in the outer parts. In agreement with earlier studies, the sign in the outer corona is found to be opposite to that inside the dynamo. Line-of-sight observations of polarized emission are synthesized to explore the feasibility of using the local reduction of Faraday depolarization to infer the sign of helicity of magnetic fields in the solar corona. This approach was previously identified as an observational diagnostic in the context of galactic magnetic fields. Based on our simulations, we show that this method can be successful in the solar context if sufficient statistics are gathered by using averages over ring segments in the corona separately for the regions north and south of the solar equator.

sted, utgiver, år, opplag, sider
2017. Vol. 845, nr 2, artikkel-id L15
Emneord [en]
dynamo, magnetohydrodynamics (MHD), Sun: magnetic fields, turbulence
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-147077DOI: 10.3847/2041-8213/aa844bISI: 000407971200003OAI: oai:DiVA.org:su-147077DiVA, id: diva2:1142135
Tilgjengelig fra: 2017-09-18 Laget: 2017-09-18 Sist oppdatert: 2022-02-28bibliografisk kontrollert

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