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Mean Field Dynamo Saturation: Toward Understanding Conflicting Results

Published online by Cambridge University Press:  30 March 2016

Eric G. Blackman  and
George B. Field
Eric G. Blackman
Affiliation:
Dept. of Physics & Astronomy, University of Rochester, NY 91125
George B. Field
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138

Abstract

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Mean field dynamos may explain the origin of large scale magnetic fields of galaxies, but controversy arises over the extent of dynamo quenching by the growing field. Here we explain how apparently conflicting results may be mutually consistent, by showing the role of magnetic helicity conservation and boundary terms usually neglected. We estimate the associated magnetic energy flowing out of the Galaxy but emphasize that the mechanism of field escape needs to be addressed.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 12: Highlights of Astronomy. As presented at the XXIVth General Assembly of the IAU, 2000 , 2002 , pp. 736 - 738
Copyright
Copyright © Astronomical Society of Pacific 2002

References

Blackman, E.G. & Field, G.B. 1999, ApJ, 521, 597 CrossRefGoogle Scholar
Blackman, E.G. & Field, G.B. 2000a, ApJ, 534, 984 CrossRefGoogle Scholar
Blackman, E.G. & Field, G.B. 2000b, MNRAS, in press, astro-ph/9912459Google Scholar
Berger, M.C. & Field, G.B. 1984, JFM, 147, 133 CrossRefGoogle Scholar
Brandenburg, A. 2000, submitted to ApJ, astro-ph/0006186Google Scholar
Cattaneo, F., & Hughes, D.W. 1996, Phys. Rev. E. 54, 4532 CrossRefGoogle Scholar
Cattaneo, F., Hughes, D.W., & Kim, E.-J. 1996, Phys.Rev.Lett, 76, 2057 CrossRefGoogle Scholar
Elsässer, W.M. 1956, Rev. Mod. Phys. 23, 135 CrossRefGoogle Scholar
Field, G.B., Blackman, E.G., & Chou, H. 1999, ApJ, 513, 638 CrossRefGoogle Scholar
Kulsrud, R. 1999, ARA&A, 37, 37 Google Scholar
Moss, D., Shukurov, A., & Sokoloff, D. 1999, A&A, 340, 120 Google Scholar
Parker, E.N. 1979, Cosmical Magnetic Fields (Oxford: Clarendon Press)Google Scholar
Pevtsov, A., Canfield, R.C., & Brown, M.R., eds. 1999, Magnetic Helicity in Space and Laboratory Plasmas (American Geophysical Union)Google Scholar
Pouquet, A., Frisch, U., & Léorat, J. 1976, JFM, 77, 321 CrossRefGoogle Scholar
Reynolds, R.J., Haffner, L.M., & Tufte, S.L. 1999, ApJ, 525, 21 CrossRefGoogle Scholar
Savage, B.D., 1995, in The Physics of the Interstellar Medium and Intergalactic Medium, Ferrara, A., McKee, C.F., Heiles, C., & Shapiro, P.R. eds., ASP Conf. Ser. vol 80 (San Francisco: PASP), 233 Google Scholar