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1 results

  • Differential topology method of identifying 3D null points in solar vector magnetic fields

  • Hui Zhao, Jingxiu Wang, Jun Zhang, Chijie Xiao
  • Journal:
    Proceedings of the International Astronomical Union / Volume 2 / Issue S233 / March 2006
    Published online by Cambridge University Press:
    01 November 2006, pp. 369-372
    Print publication:
    March 2006
    • Article
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  • Employing the Poincaré index of isolated null-point in a vector field, we work out a mathematical method of searching 3D null-points in coronal magnetic fields. After introducing the theory of differential topology, we test the method by using the analytical model of Brown & Priest. The location of null-point identified by our method coincides precisely with the analytical solution. Finally we apply the method to search 3D null-points in coronal magnetic fields reconstructed based on observed magnetograms of two active regions (NOAA AR 10488 and AR 10720). We find that the 3D null-points seem to be a key element to the magnetic topology associated with flare occurrence.