Abstracts Details


First Name * : Zihao
Last Name * : Yang
Affiliation * : Peking University
Abstract Type * : Poster
Title * : Brightening of a Coronal Loop and the Associated Jet Activity Observed with Hinode/EIS and SDO/AIA
Author(s) * : Zihao Yang, David Long, Deborah Baker, Hui Tian, Hardi Peter, Tanmoy Samanta
Abstract Session * : Thermal and magnetic coupling through the atmosphere
Abstract * : The physical mechanism that heats the building blocks of closed-field coronal regions, coronal loops, is still not well understood. With spectroscopic observation of Hinode/EIS and multi-channel imaging observation of SDO/AIA, we investigate the brightening of a coronal loop on September 9th, 2017. The AIA observation clearly reveals a sudden brightening of a coronal loop, which appears to be related to repetitive jet activity at one footpoint of the loop. The jets show both upward and downward motions along the loop. Possible twisting motions of the jets are also observed with AIA. Interestingly, the EIS observation reveals a Doppler shift pattern characterized by adjacent blueshift and redshift at the location of the jets, which is consistent with the jet dynamics observed with AIA. We suggest that the jets may transport some materials upward to fill the coronal loop. Twisting motions at one footpoint possibly lead to field line braiding and formation of small-scale current sheets at many different locations along the loop. Magnetic reconnection events within these current sheets efficiently heat the loop to coronal temperatures. We have also examined the observations from different passbands of AIA, which provide us important information on the heating and cooling of the loop.