题目：Dynamics of coronal Brights points

报告人：Prof. Dipankar Banerjee

单位：Indian Institute of Astrophysics

报告时间：2015年4月29日（周三）下午4:00

地点：闻天楼南楼208

Coronal bright points (BPs) are small-scale luminous features seen in the solar corona. Quasi-periodic brightnings are frequently observed in the BPs

and are generally linked with underneath magnetic flux changes. We study the dynamics of a BP seen in the coronal hole using the Atmospheric

Imaging Assembly (AIA) images, the Helioseismic and Magnetic Imager (HMI) magnetogram on board the Solar Dynamics Observatory (SDO) and

spectroscopic data from the newly launched Interface Region Imaging Spectrograph (IRIS). I will show the viewpoints of bright points how it evolved

with time. The present analysis shows that the BP evolves throughout our observing period along with changes in underlying photospheric magnetic

flux and shows periodic brightnings in different EUV and FUV images. With highest possible spectral and spatial resolution of IRIS, we attempted to

identify the sources of these oscillations. We propose that transition region explosive events (EEs) originating from small scale reconnections and

the reconnection outflows are affecting the line profiles. The correlation between all these parameters is consistent with the repetitive reconnection

scenario.