Relationship between electric currents, photospheric motions, chromospheric activity, and magnetic field topology

Details Relationship between electric currents, photospheric motions, chromospheric activity, and magnetic field topology Relationship between electric currents, photospheric motions, chromospheric activity, and magnetic field topology

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..149..309v&link_type=abstract

Solar Physics, vol. 149, no. 2, p. 309-330

Physics

37

Chromosphere, Field Aligned Currents, Magnetic Field Configurations, Solar Corona, Solar Flares, Solar Magnetic Field, Solar Prominences, Sunspots, Coronagraphs, Current Density, Filtergrams, H Alpha Line, Magnetic Field Reconnection, Magnetic Signatures, Mathematical Models, Solar Flux, Spectrographs, Spectroheliographs, Stellar Models

Scientific paper

Through coordinated observations made during the Max'91 campaign in June 1989 in Potsdam (magnetograms), Debrecen (white light and H(alpha)), and Meudon (MSDP), we follow the evolution of the sunspot group in active region NOAA 5555 for 6 days. The topology of the coronal magnetic field is investigated by using a method based on the concept of separatrices -- applied previously (Mandrini et al., 1991) to a magnetic region slightly distorted by field-aligned currents. The present active region differs by having significant magnetic shear. We find that the H(alpha) flare kernels and the main photospheric electric current cells are located close to the intersection of the separatrices with the chromosphere, in a linear force-free field configuration adapted to the observed shear. Sunspot motions, strong currents, isolated polarities, or intersecting separatrices are not in themselves sufficient to produce a flare. A combination of them all is required. This supports the idea that flares are due to magnetic reconnection, when flux tubes with field-aligned currents move towards the separatrix locations.

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