Mathematics – Logic
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ep%26s...53.1011d&link_type=abstract
Earth, Planets and Space, Volume 53, p. 1011-1019.
Mathematics
Logic
4
Scientific paper
We present the temporal evolution of magnetic field topology in the magnetotail with a southward IMF in order to identify the magnetic reconnection. The magnetic field topology is uniquely determined by the eigenvalues of the critical points, if they are not degenerated. This is because the critical points, their number, and the rules between them characterize the whole magnetic field pattern. At the critical points, the magnetics become zero. The magnetic vector field curves and surfaces are both integrated out along the principal directions of certain classes of critical points including the Earth's dipole magnetic field. The skeleton that includes the critical points, characteristic curves, and surfaces provides the three-dimensional topological structure of the reconnection. The change of the skeleton, i.e. the change of the topology, has revealed the occurrence of magnetic reconnection. Namely, three-dimensional "X-points" or the more-than-two critical points that are saddle and connected each other are unstable and can move, vanish, and generated.
Dongcai S.
Ichikawai T.
Li Yadong
Nishikawa Ken
Xiao Chengshan
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