TY - JOUR
T1 - Mach number dependence of turbulent magnetic field amplification
T2 - Solenoidal versus compressive flows
AU - Federrath, C.
AU - Chabrier, G.
AU - Schober, J.
AU - Banerjee, R.
AU - Klessen, R. S.
AU - Schleicher, D. R.G.
PY - 2011/9/9
Y1 - 2011/9/9
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=80052699456&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.107.114504
DO - 10.1103/PhysRevLett.107.114504
M3 - Article
SN - 0031-9007
VL - 107
JO - Physical Review Letters
JF - Physical Review Letters
IS - 11
M1 - 114504
ER -