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2-D numerical simulation of the ambipolar filamentation of turbulent magnetic fields

Franqueira, M. and Tagger, M. and Gómez de Castro, Ana Inés (2000) 2-D numerical simulation of the ambipolar filamentation of turbulent magnetic fields. Astrophysics and space science, 272 . pp. 307-310. ISSN 0004-640X

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Abstract

Magnetic fields play an important role in astrophysics and they often dominate the behavior of magnetized media. We simulate the mechanism (Tagger et al., 1995) by which turbulence in a weakly ionized plasma, as it cascades to the ambipolar scale (where the neutrals are imperfectly coupled to the ions) leads to a filamentation of the magnetic flux tubes: the turbulent velocity of the neutrals is higher in the more ionized regions, because they are better coupled to the ions. This results in a non-linear ponderomotive (< v.del v >) force driving them out of the ionized regions, so that the initial ionization inhomogeneities are strongly amplified. This effect causes the ions and magnetic field to condense and separate from the neutrals, resulting in a filamentary structure. We present the first results of a 2-D, 2-fluid (ions and neutrals) simulation, where a magnetized, weakly ionized plasma is submitted to turbulence in the ambipolar frequency range. We discuss the efficiency of this mechanism, the filamentary structure it should produce, and its relevance to the astrophysical context.

Item Type:Article
Additional Information:Conference on Astrophysical Dynamics, APR 14-16, 1999, Evora (Portugal)
Subjects:Sciences > Mathematics > Astronomy
ID Code:16443
References:

De Pontieu, B., Haerendel, G.: 1998, A&A 338, 729.

Franqueira, M., Tagger, M., Gómez de Castro, A. I.: 1999, A&A (submitted).

Kulsrud, R., Pearce, W.: 1969, ApJ 156, 445.

Myers, P.C., Goodman, A.A.:1988, ApJ Lett 326, L27.

Stone, J.M., Norman, M.L.: 1992, ApJ SS 80, 753.

Tagger, M., Falgarone, E., Shukurov, A.: 1995, A&A 299, 940.

Deposited On:19 Sep 2012 09:05
Last Modified:07 Feb 2014 09:29

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