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Dissipative magneti...
Dissipative magnetic structures and scales in small-scale dynamos
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- Brandenburg, Axel, 1959- (författare)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Stockholm Univ, Hannes Alfvens Vag 12, SE-10691 Stockholm, Sweden.;Stockholm Univ, Oskar Klein Ctr, Dept Astron, AlbaNova, SE-10691 Stockholm, Sweden.;Carnegie Mellon Univ, McWilliams Ctr Cosmol, 5000 Forbes Ave, Pittsburgh, PA 15213 USA.;Carnegie Mellon Univ, Dept Phys, 5000 Forbes Ave, Pittsburgh, PA 15213 USA.;Ilia State Univ, Sch Nat Sci & Med, 3-5 Cholokashvili Ave, GE-0194 Tbilisi, Georgia.,Nordiska institutet för teoretisk fysik (Nordita),Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Carnegie Mellon University, USA; Ilia State University, Georgia
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- Rogachevskii, Igor (författare)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Stockholm Univ, Hannes Alfvens Vag 12, SE-10691 Stockholm, Sweden.;Ben Gurion Univ Negev, Dept Mech Engn, POB 653, IL-84105 Beer Sheva, Israel.,Nordiska institutet för teoretisk fysik (Nordita),Ben-Gurion University of the Negev, Israel
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- Schober, Jennifer (författare)
- EPFL, Lab Astrophys, CH-1290 Sauverny, Switzerland.
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(creator_code:org_t)
- 2022-12-05
- 2022
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 518:4, s. 6367-6375
- Relaterad länk:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- dynamo
- MHD
- turbulence
- galaxies: magnetic fields
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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