Filament Eruption after the Onset of the X1.5 Flare on 2005 September 13

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Scientific paper

Erupting filaments usually play the role as the initial driver of flaring process preceding the subsequent flare emissions. In this Letter, we report a rare case that during the X1.5 flare on 2005 September 13, a filament at the boundary of the NOAA AR 0808 erupted about 13 minutes after the flare onset at 19:22 UT near the central AR neutral line. During this time period, the filament only showed a slow rising; meanwhile, a spatially associated large magnetic loop with one leg connecting to the initial flaring site began to brighten in the TRACE 195A channel. After 19:35 UT, the filament abruptly erupted together with the bright TRACE loop. Besides the moving ribbons at the first flaring site, the filament eruption caused a secondary flare identified with another set of moving ribbons. We suggest possible triggering mechanisms for the initial flare and the eruption of the peripheral flux loop system, which leads to the sympathetic flaring.

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