Acceleration through X-type coalescence in a small energetic flare |
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| Authors: | Jun-Ichi Sakai Cornelis de Jager |
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| Institution: | (1) SRON Laboratory for Space Research Sorbonnelaan, 2, 3584 CA Utrecht, The Netherlands;(2) Dept. of Applied Mathematics and Physics; Faculty of Engineering, Toyama University, 930 Toyama, Japan |
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| Abstract: | We studied the acceleration conditions in the small but fairly energetic flare of May 21, 1984 at 13 26 UT. The most pronounced aspect of this flare was a series of 13 microwave/X-ray spikes, each lasting for about 0.1 s. A previous study has shown that each of these was due to a series of successive sudden formations of small plasma knots of high-energy particles. Each of these knots lost its energy in about 50 ms. In the present study we show that these knots can originate by the process of X-type (3-D) flux tube coalescence. The predicted rise time (30 to 50 ms) and energy are in good agreement with the observationally derived parameters. |
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