Evolution of the magnetic field, when the only source of magnetic energy in the ISM are stellar magnetic fields distributed by SN explosions. The curves show the results for a spherical halo in our fiducial model with a SN efficiency of α = 0.01. We show three different mean stellar field strengths: 104 G (yellow dotted line), 103 G (green dashed line) and 102 G (solid red line). With the thin gray line we further indicate the typical saturation strength of a magnetic field generated by a small-scale dynamo.
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