Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.251..117s&link_type=abstract
In ESA Proceedings of the Joint Varenna-Abastumani International School and Workshop on Plasma Astrophysics p 117-120 (SEE N87-
Astronomy and Astrophysics
Astrophysics
Magnetic Field Configurations, Magnetostatic Fields, Solar Corona, Solar Flares, Topology, Lines Of Force, Magnetic Flux, Tearing Modes (Plasmas)
Scientific paper
The role of topological instability of magnetostatic equilibria in the generally observed activity of cosmic magnetic fields, e.g., solar coronal heating and flares, is assessed. Finite length magnetic flux tubes, representative of e.g., solar atmospheric loops, are topologically stable under rather general conditions. The tearing-mode mechanism is unlikely to play a role in such tubes. A local change of the topology is possible when the magnetic field gradient matrix becomes singular at a magnetic neutral point, in general connected with the merging or/and splitting up of neutral points. In solar active regions, there is observational evidence for flare activity at separatix surfaces which are made up of field lines tangential to the photosphere at one end and which define a cell structure of the field.
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