Mach number dependence of turbulent magnetic field amplification: solenoidal versus compressive flows

Christoph Federrath, G Chabrier, J Schober, Robi Banerjee, Ralf Klessen, D R G Schleicher

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132 Citations (Scopus)

Abstract

We study the growth rate and saturation level of the turbulent dynamo in magnetohydrodynamical simulations of turbulence, driven with solenoidal (divergence-free) or compressive (curl-free) forcing. For models with Mach numbers ranging from 0.02 to 20, we find significantly different magnetic field geometries, amplification rates, and saturation levels, decreasing strongly at the transition from subsonic to supersonic flows, due to the development of shocks. Both extreme types of turbulent forcing drive the dynamo, but solenoidal forcing is more efficient, because it produces more vorticity.
Original languageEnglish
Pages (from-to)1 - 5
Number of pages5
JournalPhysical Review Letters
Volume107
Issue number11
DOIs
Publication statusPublished - 2011
Externally publishedYes

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