Physics – Plasma Physics
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1164t&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 107, Issue A8, pp. SSH 3-1, CiteID 1164, DOI 10.1029/2001JA000278
Physics
Plasma Physics
55
Solar Physics, Astrophysics, And Astronomy: Flares, And Astronomy: Magnetic Fields, Space Plasma Physics: Magnetic Reconnection
Scientific paper
Although the analysis of observational data indicates that quasi-separatrix layers (QSLs) of magnetic configurations have to play an important role in solar flares, the corresponding theory is only at an initial stage so far. In particular, there is still a need of a proper definition of QSLs based on a comprehensive mathematical description of magnetic connectivity. Such a definition is given here by analyzing the mapping produced by the field lines which connect photospheric areas of positive and negative magnetic polarities. It is shown that magnetic configurations may have regions, where cross sections of magnetic flux tubes are strongly squashed by this mapping. These are the geometrical features that can be identified as the QSLs. The theory is applied to quadrupole configuration to demonstrate that it may contain two QSLs combined in a special structure called hyperbolic flux tube (HFT). Both theoretical and observational arguments indicate that the HFT is a preferred site for magnetic reconnection processes in solar flares.
Démoulin Pascal
Hornig Gunnar
Titov Vyacheslav S.
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