Evolution of Flare Ribbons and Energy Release

Physics

Scientific paper

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Scientific paper

We examined the relation between evolutions of flare ribb ons and released magnetic energies at a solar flare which occurred on 2001 April 10 in the active region NOAA 9415. We successfully evaluated the released energy quantitatively, based on the magnetic reconnection model. We measured the photospheric magnetic field strengths and the separation speeds of the fronts of the Hα flare ribb on, and estimated the released magnetic energy at the flare by using those values. Then, we compared the estimated energy release rates with the nonthermal behaviors observed in hard X-rays and microwaves. We found that those at the Hα kernels associated with the HXR sources are locally large enough to explain the difference between the spatial distribution the Hα kernels and the hard X-ray sources. Their temporal evolution of the energy release rates also shows peaks corresponding to hard X-ray bursts.

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