2017/06/30 by Axel Brandenburg, Mohira B. Ashurova, Sarah Jabbari · 5 citations
Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #Context (archaeology) #Corona (planetary geology) #Depolarization #Dynamo #Electrical and Electromagnetic Research #Faraday cage #Faraday effect #Geomagnetism and Paleomagnetism Studies #Helicity #Magnetic helicity #Sign (mathematics) #Solar and Space Plasma Dynamics #astro-ph.SR
paper · pdf · doi:10.3847/2041-8213/aa844b
published in The Astrophysical Journal Letters 845(2), L15 (IOP Publishing) · 5 pages, 3 figures, published in ApJL
openalex created_date 2017/07/14 · arxiv created 2017/08/17 · openalex publication_date 2017/08/17 · arxiv updated 2017/08/18 · openalex updated_date 2026/08/06
Abstract 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.