Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-23T18:08:46.571Z Has data issue: false hasContentIssue false
  • English
  • Français

Generation of the Seed Magnetic Field

Published online by Cambridge University Press:  19 July 2016

A. Lazarian
A. Lazarian*
Affiliation:
DAMTP, University of Cambridge, UK

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Two mechanisms of the galactic seed field generation are discussed. One of the mechanisms implies a direct generation of the seed magnetic field through a battery process (Lazarian 1992a). The other accounts for the possibility of the preliminary amplification of the magnetic field on a scale of molecular clouds (Lazarian 1992b). This means that the galactic dynamo can feed on the non-zero average value of the magnetic field amplified by such a small-scale dynamo. It is shown that both mechanisms can generate an adequate seed field. These two scenarios of the seed magnetic field generation can be distinguished by an analysis of the present day galactic magnetic structure.

Keywords

seed fielddynamomolecular cloudsISM
Type
9. Magnetohydrodynamic Phenomena in the Interstellar Medium Related to Dynamo Processes
Information
Symposium - International Astronomical Union , Volume 157: The Cosmic Dynamo , 1993 , pp. 421 - 425
Copyright
Copyright © Kluwer 1993 

References

Alfvén, H. and Falthammar, C.-G.: 1963, Cosmical Electrodynamics , Oxford, Clarendon Press, p.109.Google Scholar
Biermann, L.: 1950, Z. Naturf. A. , 5, 65.Google Scholar
Bisnovatyi-Kogan, G.S. & Ruzmaikin, A.A.: 1976, Astrophys. Space Sci. , 42, 401.Google Scholar
Catani, D. and Sacchi, C.: 1966, Nuovo Cimento , XLVIB, No. 2, 258.Google Scholar
Ferrière, K. Mf.: 1992, ApJ , 389, 286.Google Scholar
Krause, F., Rädler, K.-H.: 1980, Mean-Field Magnetohydrodynamics and Dynamo Theory , Akademie-Verlag, Berlin, p.Google Scholar
Kulsrud, R.M. and Anderson, S.W.: 1992, Ap. J. , 396, 606.Google Scholar
Lazarian, A.: 1992a, A&A , 264, 32.Google Scholar
Lazarian, A.: 1992b, Magnetic field generation within molecular clouds in The Cosmic Dynamo , ed. Krause, F., Rädler, K.H. and Rüdiger, G., Kluwer: Potsdam, p.Google Scholar
Lazarian, A.: 1992c, Statistical method for astrophsical turbulence invesgation in The Cosmic Dynamo , ed. Krause, F., Rädler, K.H. and Rüdiger, G., Kluwer: Potsdam, p.Google Scholar
Lazarian, A.: 1992d, Astron. and Astrophys. Transactions , 3, 33.Google Scholar
Lesch, H., Crusius, A., Schlickeiser, R. and Wielebinski, R.: 1989, A&A , 217, 99.Google Scholar
Mestel, L. and Moss, D.L.: 1983, MNRAS , 204, 557.Google Scholar
Moffatt, H.K.: 1978, Magnetic Field Generation in Electric Fluids, Cambridge University Press.Google Scholar
Parker, E.N.: 1979, Cosmical Magnetic Fields , Clarendon Press: Oxford.Google Scholar
Rees, M.J.: 1987, QJRAS , 28, 197.Google Scholar
Ruzmaikin, A. A., Sokolov, D. D. and Shukurov, A. M.: 1988, Magnetic fields of Galaxies. Kluwer Acad. Publ. Google Scholar
Shull, J.M.: 1987, Interstellar Processes , eds. Hollenbach, D.J. and Thronson, H.A., Reidel: Dordrecht, p.225.Google Scholar