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E and B Polarizations from Inhomogeneous and Solar Surface Turbulence
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi. University of Colorado, USA; Carnegie Mellon University, USA.ORCID-id: 0000-0002-7304-021X
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita).
Vise andre og tillknytning
Rekke forfattare: 72019 (engelsk)Inngår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 870, nr 2, artikkel-id 87Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Gradient- and curl-type or E- and B-type polarizations have been routinely analyzed to study the physics contributing to the cosmic microwave background polarization and galactic foregrounds. They characterize the parity-even and parity-odd properties of the underlying physical mechanisms, such as, for example, hydromagnetic turbulence in the case of dust polarization. Here, we study spectral correlation functions characterizing the parity-even and parity-odd parts of linear polarization for homogeneous and inhomogeneous turbulence to show that only the inhomogeneous helical case can give rise to a parity-odd polarization signal. We also study nonhelical turbulence and suggest that a strong non-vanishing (here negative) skewness of the E polarization is responsible for an enhanced ratio of the EE to the BB (quadratic) correlation in both the helical and nonhelical cases. This could explain the enhanced EE/BB ratio observed recently for dust polarization. We close with a preliminary assessment of using the linear polarization of the Sun to characterize its helical turbulence without being subjected to the pi ambiguity that magnetic inversion techniques have to address.

sted, utgiver, år, opplag, sider
2019. Vol. 870, nr 2, artikkel-id 87
Emneord [en]
dynamo, magnetohydrodynamics (MHD), Sun: magnetic fields, turbulence
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-165668DOI: 10.3847/1538-4357/aaf383ISI: 000455820100033OAI: oai:DiVA.org:su-165668DiVA, id: diva2:1286261
Tilgjengelig fra: 2019-02-06 Laget: 2019-02-06 Sist oppdatert: 2022-02-26bibliografisk kontrollert

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