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Compensating Faraday Depolarization by Magnetic Helicity in the Solar Corona
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Colorado, USA.
Number of Authors: 3
2017 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 845, no 2, L15Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
2017. Vol. 845, no 2, L15
Keyword [en]
dynamo, magnetohydrodynamics (MHD), Sun: magnetic fields, turbulence
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-147077DOI: 10.3847/2041-8213/aa844bISI: 000407971200003OAI: oai:DiVA.org:su-147077DiVA: diva2:1142135
Available from: 2017-09-18 Created: 2017-09-18 Last updated: 2017-09-18Bibliographically approved

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Brandenburg, Axel
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