Flare ribbon expansion and energy release |
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| Authors: | Ayumi Asai Takaaki Yokoyama Masumi Shimojo Satoshi Masuda Kazunari Shibata |
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| Institution: | (1) Nobeyama Solar Radio Observatory, 384-1305 Minamisaku, Nagano, Japan;(2) Department of Earth and Planetary Science, University of Tokyo, Hongo, Bunkyo, 113-0033 Tokyo, Japan;(3) Solar-Terrestrial Environment Laboratory, Nagoya University, 442-8507 Toyokawa, Aichi, Japan;(4) Kwasan and Hida Observatories, Kyoto University, 607-8471 Yamashina, Kyoto, Japan |
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| Abstract: | We report a detailed examination about the relationship between the evolution of the Hα flare ribbons and the released magnetic
energy during the April 10 2001 flare. In the Hα images, several bright kernels are observed in the flare ribbons. We identified
the conjugated foot-points, by analyzing the lightcurves at each Hα kernels, and showed their connectivities during the flare.
Then, based on the magnetic reconnection model, we calculated quantitatively the released energy by using the photospheric
magnetic field strengths and separation speeds of the Hα flare ribbons. Finally, we examined the downward motions which are
observed at the Hα kernels. We found that the stronger the red-asymmetry tends to be associated with the brighter the Hα kernel. |
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| Keywords: | Sun: activity Sun: flares chromosphere corona X-rays gamma rays |
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