SciELO - Scientific Electronic Library Online

 
vol.47 número1FUNDPAR: A program for Deriving Fundamental Parameters from Equivalent WidthsMid-Infrared Observations of Planetary Nebulae detected in the GLIMPSE 3D Survey índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

  • Não possue artigos similaresSimilares em SciELO

Compartilhar


Revista mexicana de astronomía y astrofísica

versão impressa ISSN 0185-1101

Resumo

SANCHEZ-SALCEDO, F. J.  e  SANTILLAN, A. The Parker instability in axisymmetric filaments: final equilibria with longitudinal magnetic field. Rev. mex. astron. astrofis [online]. 2011, vol.47, n.1, pp.15-29. ISSN 0185-1101.

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.

Palavras-chave : instabilities; ISM; ISM [structure]; magnetic fields; MHD.

        · resumo em Espanhol     · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons