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The effects of vertical outflows on disk dynamos

Nov, 2000
14 pages
Published in:
  • Astron.Astrophys. 370 (2001) 635-648
e-Print:
DOI:
Report number:
  • NORDITA-2000-115-AP
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Abstract: (arXiv)
We consider the effect of vertical outflows on the mean-field dynamo in a thin disk. These outflows could be due to winds or magnetic buoyancy. We analyse both two-dimensional finite-difference numerical solutions of the axisymmetric dynamo equations and a free-decay mode expansion using the thin-disk approximation. Contrary to expectations, a vertical velocity can enhance dynamo action, provided it is not too strong. In the nonlinear regime this can lead to super-exponential growth of the magnetic field.