1. 学术报告： Lessons from a composite solar flare 时间；2018年6月29日下午2：30 地点：行政教学楼1514室 报告人：Jeongwoo Lee博士 单位： Kyung Hee University 摘要： A composite (or compound) flare has a characteristic time profile consisting of both an impulsive flare and a gradual (or long-duration) flare. There can be various ways to view this phenomenon: for instance, either a magnetically confined flare preceding an eruptive flare or a nonthermal flare followed by a thermal flare. For the former interpretation, analysis of magnetic field structure will be needed, and, for the latter, separation of thermal/nonthermal components in radiations will. In this talk, I will discuss these issues based on our recent studies on a composite event consisting of an impulsive flare SOL2015-06-21T01:42 (GOES class M2.0) and a long-duration flare SOL2015-06-21T02:36 (M2.6) from NOAA Active Region 12371. We used the microwave maps from the Nobeyama Radioheliograph (NoRH) to infer high-energy electrons, and the EUV and magnetogram data from the Solar Dynamics Observatory (SDO) for the magnetic field context. A nonlinear force-free field extrapolation was also performed to assist the analysis of the magnetic field structure. Our studies have revealed that a composite flare possesses much more complicated characteristics than the above speculation solely based on the time profile, and that it offers a special opportunity for clarifying how a flux rope evolves to be able to break out of a magnetically confined system.

李勤秀 Posted at 2018-06-13 15:53 CST Last modified at 2018-06-13 15:53 CST Link to this poster Top