Relationship between magnetic field evolution and flaring sites in AR 6659 in June 1991

Details Relationship between magnetic field evolution and flaring sites in AR 6659 in June 1991 Relationship between magnetic field evolution and flaring sites in AR 6659 in June 1991

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..150..199s&link_type=abstract

Solar Physics, vol. 150, no. 1-2, p. 199-219

Physics

57

Faculae, Field Aligned Currents, Fragmentation, Magnetic Energy Storage, Magnetic Field Configurations, Magnetic Flux, Mass Transfer, Mathematical Models, Solar Corona, Solar Flares, Solar Magnetic Field, Sunspots, Astronomical Photography, Coronagraphs, Coronal Loops, Gradients, Penumbras, Shearing, Solar Rotation, Umbras

Scientific paper

During the international campaign of June 1991, the active region AR 6659 produced six very large, long-duration flares (X10/12) during its passage across the solar disk. We present the characteristics of four of them (June 4, 6, 9, 15). Precise measurements of the spot motions from Debrecen and Tokyo white-light pictures are used to understand the fragmentation of the main sunspot group with time. This fragmentation leads to a continuous restructuring of the magnetic field pattern while rapid changes are evidenced due to fast new flux emergence (magnetograms of Marshall Space Flight Center (MSFC), Huairou). The first process leads to a shearing of the field lines along which there is energy storage; the second one is the trigger which causes the release of energy by creating a complex topology. We conjecture that these two processes with different time scales are relevant to the production of flares.

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