Solar Physics

, Volume 235, Issue 1–2, pp 259–280

Coronal Magnetic Topologies in a Spherical Geometry I. Two Bipolar Flux Sources

  • R. C. Maclean
  • G. Hornig
  • E. R. Priest
  • C. Beveridge
Article

Abstract

The evolution of the solar corona is dominated to a large extent by the hugely complicated magnetic field which threads it. Magnetic topology provides a tool to decipher the structure of this field and thus help to understand its behaviour. Usually, the magnetic topology of a potential field is calculated due to flux sources on a locally planar photospheric surface. We use a Green's function method to extend this theory to sources on a global spherical surface. The case of two bipolar flux-balanced source regions is studied in detail, with an emphasis on how the distribution and relative strengths of the source regions affect the resulting topological states. A new state with two spatially distinct separators connecting the same two magnetic null points, called the “dual intersecting“ state, is discovered.

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Copyright information

© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  • R. C. Maclean
    • 1
  • G. Hornig
    • 1
  • E. R. Priest
    • 1
  • C. Beveridge
    • 2
  1. 1.Institute of MathematicsUniversity of St. AndrewsSt. Andrews, FifeU.K.
  2. 2.Department of PhysicsMontana State UniversityBozemanU.S.A.

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