Coincidence between H-alpha flare kernels and peaks of observed longitudinal electric current densities

Details Coincidence between H-alpha flare kernels and peaks of observed longitudinal electric current densities Coincidence between H-alpha flare kernels and peaks of observed longitudinal electric current densities

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..109...81l&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 109, no. 1, 1987, p. 81-90.

Physics

55

Current Density, Electric Current, H Alpha Line, Solar Flares, Solar Magnetic Field, Coronal Loops, Energy Sources, Energy Storage, Magnetohydrodynamic Stability, Solar Activity, X Ray Irradiation

Scientific paper

Large-scale filtergrams of a hitherto neglected class 1B flare are compared with previously published vector magnetograms and maps of photospheric longitudinal electric current density (Hagyard et al., 1985). The vector magnetic fields were mapped simultaneously with the eruption of this flare. A coincidence, to within the + or - 2 arcsec registration accuracy of the data, is found between the flare kernels and the locations of maximum shear and of peak values in the longitudinal electric current density. The kernels brighten in a way which implies that the preflare heating and the main release of flare energy are spatially coincident within the limits of resolution (about 2 arcsec). A pronounced magnetic shear exists in the vertical direction at the location of the strongest flare kernels. Evidence is provided that the electric currents could be maintained by the energy stored in the sheared transverse magnetic field and that the amount of energy released is proportional to the amount stored. These circumstances are consistent with theories in which flares are triggered by plasma instabilities due to surplus electric currents.

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