Superpenumbral chromospheric flare

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	Superpenumbral chromospheric flare
	Liu Suo 1; Zhang Hongqi 1; Choudhary Debiprasad P 1; Srivastava Abhishek K 2; Dwivedi Bhola Nath 2
刊名	Research in Astronomy and Astrophysics
	2018
卷号	18 期号:10
ISSN号	1674-4527
英文摘要	We observed a C-class flare at the outer boundary of the superpenumbra of a sunspot. The flare was triggered by an emerging magnetic bipolar region that was obliquely oriented with respect to the superpenumbral fibrils. The flare started due to the low height magnetic reconnection of emerging magnetic flux with a superpenumbral field resulting in hot multi-temperature plasma flows in the inverse Evershed flow channel and its overlying atmosphere. Inverse Evershed flows in the chromosphere start from the superpenumbra towards the sunspot that end at the outer boundary of the penumbra. The hot plasma flow towards the sunspot in the inverse Evershed channels show about 10 km s(-1) higher velocity in H alpha wavelengths compared to the plasma emissions at various temperatures as seen in different AIA filters. Even though these velocities are about seven times higher than the typical inverse Evershed flow speeds, the flow is diminished at the outer boundary of the sunspot's penumbra. This suggests that the superpenumbral field lines that carry inverse Evershed flows are discontinued at the boundary where the penumbral field lines dive into the sun and these two sets of field lines are completely distinct. The discontinuity in the typical magnetic field and plasma properties at the adjoining of these two sets of field lines further leads to discontinuity in the characteristic magnetoacoustic and Alfvdn speeds, thereby stopping the plasma flows further on. The multi-temperature plasma in the inverse Evershed channels exhibits possible longitudinal oscillations initially during the onset of the flare, and later flows towards the sunspot. In the multi-temperature view, the different layers above the flare region have a mixture of supersonic as well as subsonic flows.
资助项目	[Chinese Academy of Sciences] ; [Chinese Academy of Science President's International Fellowship Initiative]
语种	英语
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/22872]
专题	中国科学院国家天文台
作者单位	1.中国科学院国家天文台 2.Department of Physics, Indian Institute of Technology
推荐引用方式 GB/T 7714	Liu Suo,Zhang Hongqi,Choudhary Debiprasad P,et al. Superpenumbral chromospheric flare[J]. Research in Astronomy and Astrophysics,2018,18(10).
APA	Liu Suo,Zhang Hongqi,Choudhary Debiprasad P,Srivastava Abhishek K,&Dwivedi Bhola Nath.(2018).Superpenumbral chromospheric flare.Research in Astronomy and Astrophysics,18(10).
MLA	Liu Suo,et al."Superpenumbral chromospheric flare".Research in Astronomy and Astrophysics 18.10(2018).