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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
2011
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| Accès en ligne: | https://www.redalyc.org/articulo.oa?id=57119922002 |
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- The Parker instability in axisymmetric filaments: final equilibria with longitudinal magnetic field F. J. Sánchez-Salcedo A. Santillán Física, Astronomía y Matemáticas ISM MHD structure Instabilities agnetic fields We study the final equilibrium states of the Parker instability arising from an initially unstable cylindrical equilibrium configuration of gas in the presence of a radial gravitational field and a longitudinal magnetic field. The aim of this work is to compare the properties of the nonlinear final equilibria with those found in a system with Cartesian geometry. Maps of the density and magnetic field lines, when the strength of the gravitational field is constant, are given in both geometries. We find that the magnetic buoyancy and the drainage of gas along field lines are less efficient under axial symmetry than in a Cartesian atmosphere. As a consequence, the column density enhancement arising in gas condensations in the axially-symmetric model is smaller than in a Cartesian geometry. The magnetic-to-gas pressure ratio in the final equilibrium state takes more extreme values in the Cartesian model. Models with non-uniform radial gravity are also discussed. 2011 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57119922002 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.1 Vol.47