Gravitational stability of a cylindrical plasma with an azimuthal and an axial magnetic field

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McLeman, J. A. and Wang, C. H. -T. and Bingham, R. (2012) Gravitational stability of a cylindrical plasma with an azimuthal and an axial magnetic field. Astrophysical Journal, 756 (2). 105. ISSN 1538-4357 (https://doi.org/10.1088/0004-637X/756/2/105)

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Abstract

We consider the gravitational stability of a current-carrying filamentary cloud in the presence of both axial and azimuthal magnetic fields using a simple analytic model. The azimuthal magnetic field is shown to give rise to a new contribution, dictated by Ampere's law, in the corresponding virial equation for magnetohydrodynamic equilibrium. From this we obtain a computationally inexpensive guidance on the gravitational stability of current-carrying filamentary clouds. The approach not only provides a fresh insight into the essential physical mechanisms involved but also demonstrates clearly that, for sufficiently large and yet astronomically realistic currents, the azimuthal magnetic field can cause filamentary clouds to undergo instability.

ORCID iDs

McLeman, J. A., Wang, C. H. -T. and Bingham, R. ORCID logoORCID: https://orcid.org/0000-0002-9843-7635;
  • Item type:Article
    ID code:42255
    Dates:
    Date
    Event
    10 September 2012
    Published
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:04 Dec 2012 16:58
    Last modified:11 Nov 2024 10:17
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/42255
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