Solar jet-like features rooted in flare ribbons

PASJ: Publications of the Astronomical Society of Japan

Li, Xiaohong¹  Yang, Shuhong¹  Hou, Yijun²  Zhang, Jun² 

[1] CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China;School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China

关键词: Sun: flares;    Sun: evolution;    Sun: atmosphere;    Sun: activity;   

DOI  :  10.1093/pasj/psy128

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Employing the high spatio-temporal Interface Region Imaging Spectrograph 1330 Å observations, we investigated the jet-like features that occurred during the X8.2 class flare in NOAA active region (AR) 12673 on 2017 September 10. These jet-like features were rooted in the flare ribbons. We examined 15 features, and the mean values of the lifetimes, projected widths, lengths, and velocities of these features were 87 s, 890 km, 2.7 Mm, and 70 km s−1, respectively. We also observed many jet-like features which happened during the X1.0 class flare on 2014 October 25. We studied the spectra at the base of a jet-like feature during its development. The Fe xxi 1354.08 Å line in the corona displays blueshift, while the Si iv 1402.77 Å line in the transition region exhibits redshift, which indicates the chromospheric evaporation. This is the first time that the jet-like features are reported to be rooted in the flare ribbons, and we suggest that these jet-like features were driven by the mechanism of chromospheric evaporation.

【 授权许可】

CC BY