Dynamics, Catastrophe and Magnetic Energy Release or Toroidal Solar Current Loops

  1. C. T. Russell,
  2. E. R. Priest and
  3. L. C. Lee
  1. James Chen

Published Online: 21 MAR 2013

DOI: 10.1029/GM058p0269

Physics of Magnetic Flux Ropes

Physics of Magnetic Flux Ropes

How to Cite

Chen, J. (1990) Dynamics, Catastrophe and Magnetic Energy Release or Toroidal Solar Current Loops, in Physics of Magnetic Flux Ropes (eds C. T. Russell, E. R. Priest and L. C. Lee), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM058p0269

Author Information

  1. Space Plasma Branch, Naval Research Laboratory, Washington, DC 20375–5000

Publication History

  1. Published Online: 21 MAR 2013
  2. Published Print: 1 JAN 1990

ISBN Information

Print ISBN: 9780875900261

Online ISBN: 9781118663868

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Keywords:

  • Solar photosphere;
  • Magnetic flux;
  • Astrophysics

Summary

An earlier paper has shown that toroidal current loops can exhibit a wide range of equilibrium and dynamical behavior under the action of toroidal forces; slow or rapid (supersonic) mass motion accompanied by a corresponding range of magnetic energy dissipation. In this paper, further dynamical properties are explored, including nonzero ambient field Bs previously excluded from the dynamics. The possible influence of subphotospheric current/flux structures on the loop dynamics is discussed. Distinct mechanisms for in situ (coronal) and subphotospheric magnetic energy storage are considered. A scenario of subphotospheric trigger for eruptive processes and magnetic energy release is discussed. Quasi-equilibrium evolution of an isolated toroidal current loop is studied with respect to specifying the poloidal flux of the loop. It is found that no bifurcation results if the infinitely conducting photosphere assumption is imposed but that a cusp catastrophe is obtained if a subphotospheric flux structure is included.