%0 Generic %1 cho2023obtaining %A Cho, Jungyeon %D 2023 %K Astrophysics %T Obtaining strength of magnetic field from E and B modes of dust polarization %U http://arxiv.org/abs/2306.11571 %X We perform numerical simulations of supersonic magnetohydrodynamic (MHD) turbulence and calculate Fourier power spectra of E and B modes arising from dust polarization. We pay close attention to the ratio of E-mode to B-mode spectra (a.k.a. E/B power asymmetry) on small spatial scales. We find that the ratio depends on the strength of the mean magnetic field: the stronger the mean magnetic field is, the smaller the ratio is. More precisely speaking, the ratio scales with the Alfvén Mach number $M_A$, the root-mean-square velocity divided by the Alfvén speed of the mean magnetic field, when it lies in the range $1M_A 30$. This result implies that we can use the E/B power asymmetry to constrain the strength of the mean magnetic field in supersonic and super-Alfvénic MHD turbulence.

@misc{cho2023obtaining, abstract = {We perform numerical simulations of supersonic magnetohydrodynamic (MHD) turbulence and calculate Fourier power spectra of E and B modes arising from dust polarization. We pay close attention to the ratio of E-mode to B-mode spectra (a.k.a. E/B power asymmetry) on small spatial scales. We find that the ratio depends on the strength of the mean magnetic field: the stronger the mean magnetic field is, the smaller the ratio is. More precisely speaking, the ratio scales with the Alfv\'en Mach number $M_A$, the root-mean-square velocity divided by the Alfv\'en speed of the mean magnetic field, when it lies in the range $1\lesssim M_A \lesssim 30$. This result implies that we can use the E/B power asymmetry to constrain the strength of the mean magnetic field in supersonic and super-Alfv\'enic MHD turbulence.}, added-at = {2023-06-22T09:48:22.000+0200}, author = {Cho, Jungyeon}, biburl = {https://www.bibsonomy.org/bibtex/203635f43c9e1d9d985b7e2ddee231473/fboulang}, description = {Obtaining strength of magnetic field from E and B modes of dust polarization}, interhash = {3f952e78300775069d69ea07078ae26c}, intrahash = {03635f43c9e1d9d985b7e2ddee231473}, keywords = {Astrophysics}, note = {cite arxiv:2306.11571Comment: 10 pages, 7 figures, Submitted to ApJ}, timestamp = {2023-06-22T09:48:22.000+0200}, title = {Obtaining strength of magnetic field from E and B modes of dust polarization}, url = {http://arxiv.org/abs/2306.11571}, year = 2023 }