Other
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340..558l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 340, May 1, 1989, p. 558-570.
Other
18
Current Sheets, Electric Current, Solar Magnetic Field, Force-Free Magnetic Fields, Magnetic Flux
Scientific paper
Two theoretical examples are given to demonstrate the spontaneous formation of electric current sheets in force-free magnetic fields frozen into a medium with an infinite electrical conductivity, as a result of the continuous displacement of the magnetic footpoints at the boundary. An initial three-lobe axisymmetric magnetic field without neutral points in the infinite medium outside a unit sphere is found to adjust to footpoint displacements by a slipping of the central lobe relative to the other two lobes. Also, a three-dimensional force-free magnetic field is studied, showing that conditions for the expulsion of flux from a local region to bring spatially separate fluxes together to form rotational discontinuities are readily obtained between ordinary magnetic surfaces.
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