Optical properties of bipolar flare kernels associated with asymmetric magnetic loops

Physics

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Coronal Loops, H Alpha Line, Optical Properties, Solar Flares, Solar Magnetic Field, Chromosphere, Electron Flux Density, Electron Precipitation, High Energy Electrons, Solar Physics, Sunspots

Scientific paper

Observations are presented for nine flares containing two principal patches of emission, or kernels, in which the kernel associated with weaker magnetic field has the greater H-alpha line width. The observations are interpreted in terms of an asymmetric bipolar magnetic loop from which high energy electrons precipitate predominantly at the loop footpoint of weaker field. Calculations are presented which indicate that, for an isotropic distribution of electron velocity vectors at their initial point of injection, the observations are consistent with a location for the injection in the upper part of the loop. The same type of model predicts the associated microwave burst to be stronger near the opposite (strong field) footpoint (Kundu and Vlahos, 1979).

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