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Dissipative magnetic structures and scales in small-scale dynamos
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). Carnegie Mellon University, USA; Ilia State University, Georgia.ORCID-id: 0000-0002-7304-021X
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Ben-Gurion University of the Negev, Israel.ORCID-id: 0000-0001-7308-4768
Rekke forfattare: 32023 (engelsk)Inngår i: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 518, nr 4, s. 6367-6375Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Small-scale dynamos play important roles in modern astrophysics, especially on galactic and extragalactic scales. Owing to dynamo action, purely hydrodynamic Kolmogorov turbulence hardly exists and is often replaced by hydromagnetic turbulence. Understanding the size of dissipative magnetic structures is important in estimating the time-scale of galactic scintillation and other observational and theoretical aspects of interstellar and intergalactic small-scale dynamos. Here we show that, during the kinematic phase of the small-scale dynamo, the cutoff wavenumber of the magnetic energy spectra scales as expected for large magnetic Prandtl numbers, but continues in the same way also for moderately small values – contrary to what is expected. For a critical magnetic Prandtl number of about 0.3, the dissipative and resistive cutoffs are found to occur at the same wavenumber. In the non-linearly saturated regime, the critical magnetic Prandtl number becomes unity. The cutoff scale now has a shallower scaling with magnetic Prandtl number below a value of about three, and a steeper one otherwise compared to the kinematic regime.

sted, utgiver, år, opplag, sider
2023. Vol. 518, nr 4, s. 6367-6375
Emneord [en]
dynamo, MHD, turbulence, galaxies: magnetic fields
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-214545DOI: 10.1093/mnras/stac3555ISI: 000904583300009OAI: oai:DiVA.org:su-214545DiVA, id: diva2:1735859
Tilgjengelig fra: 2023-02-10 Laget: 2023-02-10 Sist oppdatert: 2023-02-10bibliografisk kontrollert

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