Numerical simulations of the ambipolar filamentation process



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Franqueira, M. and Tagger, M. and Gómez de Castro, Ana Inés (2001) Numerical simulations of the ambipolar filamentation process. In FROM DARKNESS TO LIGHT: ORIGIN AND EVOLUTION OF YOUNG STELLAR CLUSTERS. Astronomical Soc Pacific, pp. 163-168. ISBN 1-58381-081-1

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We are carying out 2-D, two-fluid (ions and neutrals) numerical simulations of the ambipolar filamentation process, in which a magnetized, weakly ionized plasma is stirred by turbulence in the ambipolar frequency range. The higher turbulent velocity of the neutrals in the mast ionized regions gives rise to a non-linear force driving them out of these regions, so that the initial ionization inhomogeneities are strongly amplified. This effect, the ambipolar filamentation, causes the ions and the magnetic flux to condense and separate from the neutrals, resulting in a filamentary structure. This mechanism might help to explain some problems arising in magnetized and partially ionized astrophysical plasmas. It might provide an explanation for the spicules emerging from the solar photosphere. We also expect it to have an important role in star Formation. Under molecular cloud conditions (supersonic turbulence), we expect the mechanism to result in an additional pressure from the most ionized to the least ionized regions that efficiently separates the ions from the neutrals, favoring the gravitational collapse of the latter.

Item Type:Book Section
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3rd 3-Island European Conference on Stellar Clusters and Associations - From Darkness to Light, APR 03-08, 2000, CARGESE, FRANCE

Uncontrolled Keywords:Turbulent magnetic-fields; damped alfven waves; molecular clouds; spicules; drivers; ISM : ambipolar diffusion, turbulence; ionization, filaments, gravitational collapse; stars : formation
Subjects:Sciences > Mathematics > Astronomy
ID Code:16424
Deposited On:18 Sep 2012 09:35
Last Modified:02 Sep 2020 10:14

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