Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...310..438f&link_type=abstract
Astronomy and Astrophysics, v.310, p.438-455
Astronomy and Astrophysics
Astrophysics
15
Mhd, Ism: Magnetic Fields, Ism: Kinematics And Dynamics, Turbulence
Scientific paper
The effects of turbulent motions on the large-scale magnetic field are described by the alpha- and diffusivity tensors, whose components are known as the dynamo parameters. In this paper, we compute the dynamo parameters in the Galactic disk near the Sun, for a turbulence driven by supernova explosions: we numerically follow the time evolution of a large number of supernova remnants and superbubbles, infer their dynamical properties relevant to dynamo action, and introduce these properties into analytical formulae for the dynamo parameters established in previous papers. We find that superbubbles give a much larger contribution than supernova remnants, especially high above the Galactic midplane; the resulting dynamo parameters increase with height up to at least 3 kpc, and reach the following values at 1kpc: α_R_~αPHI_~1.5km/s and α_Z_~0.6km/s for the diagonal components of the alpha-tensor, V_esc_~7km/s for its off-diagonal component, and β_v_~β_h_~10^27^cm^2^/s for the turbulent magnetic diffusivities.
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