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Paper: Flare Onset Observed with Hinode in the 2006 December 13 Flare
Volume: 454, The 3rd Hinode Science Meeting
Page: 303
Authors: Asai, A.; Hara, H.; Watanabe, T.; Imada, S.
Abstract: We present a detailed examination of the preflare phenomena of the X3.4 flare that occurred on 2006 December 13. This flare was associated with a faint arc-shaped ejection, which is thought to be an MHD fast-mode shock wave, seen in the soft X-ray images taken with the Hinode X-Ray Telescope (XRT), just at the start of the impulsive phase of the flare. Even before the ejection, we found many preflare features, such as an S-shaped brightening (sigmoid) with XRT, chromospheric brightening at the footpoints of the sigmoid loops with the Solar Optical Telescope (SOT), a faint X-ray eruption with XRT, and so on. The EUV Imaging Spectrometer (EIS) also observed the flare, and therefore, enabled us to examine the spectroscopic features. We discuss these phenomena and the energy release prosses.
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