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Journal Article

E and B Polarizations from Inhomogeneous and Solar Surface Turbulence


Singh,  Nishant K.
Max Planck Research Group in Solar and Stellar Magnetic Activity, Max Planck Institute for Solar System Research, Max Planck Society;

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Brandenburg, A., Bracco, A., Kahniashvili, T., Mandal, S., Pol, A. R., Petrie, G. J. D., et al. (2019). E and B Polarizations from Inhomogeneous and Solar Surface Turbulence. The Astrophysical Journal, 870(2): 87. doi:10.3847/1538-4357/aaf383.

Cite as: https://hdl.handle.net/21.11116/0000-0006-5B9E-3
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 π ambiguity that magnetic inversion techniques have to address.