Extremely Large Euv Late Phase of Solar Flares

Friday, 19 December 2014
Kai Liu1, Yuming Wang2, Jie Zhang3, Xin Cheng4, Rui Liu1, Chenglong Shen5 and Shui Wang1, (1)USTC University of Science and Technology of China, Hefei, China, (2)University of Science and Technology of China, Hefei, China, (3)George Mason Univ, Fairfax, VA, United States, (4)Nanjing University, Nanjing, China, (5)University Science & Technology of China, Hefei, Anhui, China
The Extreme Ultra-Violet (EUV) late phase was a new observation feature other than impulsive or gradual phase during solar flares. It was observed as a second peak in EUV irradiance profile, especially in the line of warm temperature (~2.5MK, Fe XVI 33.5 nm). Previous works indicates that long loop arcades near the flare region would be heated during the main phase occasionally, then they went through a slow cooling process, and emitted series of EUV emissions , which formed the late phase. In this paper, a strong long-duration flare event (LDE) with extremely large late phase was observed by multiple instruments and proved to be confined. Detailed analysis were given to investigate this extraordinary event.