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Fig. 4


Evolution of the magnetic field amplified by the small-scale dynamo. The dashed lines show the evolution on the viscous scale ν, the solid lines the one on the forcing scale of the turbulence L. We use in this plot L = 103 pc. The different colors indicate different turbulent velocities: the red lines have velocities of 1 km s-1, the green lines 10 km s-1 and the orange lines 100 km s-1. The microphysical quantities are determined in Sect. 2.2. The viscosity is ν = 8.7 × 1015 cm2 s-1, the magnetic resistivity η = 37.8 cm2 s-1, the density is n = 10 cm-3 and the mean particle mass is m = 1.6 × 10-24 g. The initial magnetic field strength on the viscous scale in this plot is B0 = 10-20 G and the slope of the turbulence spectrum ϑ is 0.4.

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