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Ambipolar diffusion in large Prandtl number turbulence
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Stockholm University, Faculty of Science, Department of Astronomy. University of Colorado, USA; Carnegie Mellon University, USA,.ORCID iD: 0000-0002-7304-021X
Number of Authors: 12019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 487, no 2, p. 2673-2684Article in journal (Refereed) Published
Abstract [en]

We study the effects of ambipolar diffusion (AD) on hydromagnetic turbulence. We consider the regime of large magnetic Prandtl number, relevant to the interstellar medium. In most of the cases, we use the single-fluid approximation where the drift velocity between charged and neutral particles is proportional to the Lorentz force. In two cases we also compare with the corresponding two-fluid model, where ionization and recombination are included in the continuity and momentum equations for the neutral and charged species. The magnetic field properties are found to be well represented by the single-fluid approximation. We quantify the effects of AD on total and spectral kinetic and magnetic energies, the ohmic and AD dissipation rates, the statistics of the magnetic field, the current density, and the linear polarization as measured by the rotationally invariant E and B mode polarizations. We show that the kurtosis of the magnetic field decreases with increasing AD. The E mode polarization changes its skewness from positive values for small AD to negative ones for large AD. Even when AD is weak, changes in AD have a marked effect on the skewness and kurtosis of E, and only a weak effect on those of B. These results open the possibility of employing E and B mode polarizations as diagnostic tools for characterizing turbulent properties of the interstellar medium.

Place, publisher, year, edition, pages
2019. Vol. 487, no 2, p. 2673-2684
Keywords [en]
dynamo, MHD, polarization, turbulence, ISM: magnetic fields
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-171983DOI: 10.1093/mnras/stz1509ISI: 000474919700083OAI: oai:DiVA.org:su-171983DiVA, id: diva2:1347826
Available from: 2019-09-02 Created: 2019-09-02 Last updated: 2019-09-02Bibliographically approved

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Brandenburg, Axel
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