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Ambipolar diffusion in large Prandtl number 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
Antal upphovsmän: 12019 (Engelska)Ingår i: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 487, nr 2, s. 2673-2684Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2019. Vol. 487, nr 2, s. 2673-2684
Nyckelord [en]
dynamo, MHD, polarization, turbulence, ISM: magnetic fields
Nationell ämneskategori
Fysik
Identifikatorer
URN: urn:nbn:se:su:diva-171983DOI: 10.1093/mnras/stz1509ISI: 000474919700083OAI: oai:DiVA.org:su-171983DiVA, id: diva2:1347826
Tillgänglig från: 2019-09-02 Skapad: 2019-09-02 Senast uppdaterad: 2019-09-02Bibliografiskt granskad

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Brandenburg, Axel
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Nordiska institutet för teoretisk fysik (Nordita)Institutionen för astronomi
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