Small-scale Bright Blobs Ejected from a Sunspot Light Bridge

doi:10.3847/1538-4357/abd322

NAOC Open IR

	Small-scale Bright Blobs Ejected from a Sunspot Light Bridge
	Li,Fuyu 1; Chen,Yajie 1,2; Hou,Yijun 3; Tian,Hui 1,3; Bai,Xianyong 3; Song,Yongliang3
	2021-02-01
Source Publication	The Astrophysical Journal
ISSN	0004-637X
Volume	908 Issue:2
Abstract	Abstract Light bridges (LBs) are bright lanes that divide an umbra into multiple parts in some sunspots. Persistent oscillatory bright fronts at a temperature of ～105 K are commonly observed above LBs in the 1400/1330 ??passbands of the Interface Region Imaging Spectrograph (IRIS). Based on IRIS observations, we report small-scale bright blobs ejected from the oscillating bright front above a light bridge. Some of these blobs reveal a clear acceleration, whereas the others do not. The average speed of these blobs projected onto the plane of sky is 71.7?±?14.7 km s?1, with an initial acceleration of 1.9?±?1.3 km s?2. These blobs normally reach a projected distance of 3–7 Mm from their origin sites. They have an average projected area of 0.57?±?0.37 Mm2. The blobs were also detected in multiple extreme-ultraviolet passbands of the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory, but not in the Hα images taken by the New Vacuum Solar Telescope. The typical temperature and electron density of these blobs are around K and cm?3, respectively. The estimated kinetic and thermal energies are on the order of erg and erg, respectively. These small-scale blobs appear to show three different types of formation processes. They are possibly triggered by induced reconnection or release of enhanced magnetic tension due to interaction of adjacent shocks, local magnetic reconnection between emerging magnetic bipoles on the light bridge and surrounding unipolar umbral fields, and plasma acceleration or instability caused by upward shocks, respectively.
Keyword	Solar physics Solar activity Sunspots Solar magnetic fields
DOI	10.3847/1538-4357/abd322
Language	英语
WOS ID	IOP:0004-637X-908-2-abd322
Publisher	The American Astronomical Society
Citation statistics
Document Type	期刊论文
Identifier	http://ir.bao.ac.cn/handle/114a11/60594
Collection	中国科学院国家天文台
Corresponding Author	Tian,Hui
Affiliation	1.School of Earth and Space Sciences, Peking University, 100871 Beijing, People’s Republic of China; chenyajie@pku.edu.cn, huitian@pku.edu.cn 2.Max-Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, D-37077 G?tingen, Germany 3.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China
Corresponding Author Affilication	National Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation GB/T 7714	Li,Fuyu,Chen,Yajie,Hou,Yijun,et al. Small-scale Bright Blobs Ejected from a Sunspot Light Bridge[J]. The Astrophysical Journal,2021,908(2).
APA	Li,Fuyu,Chen,Yajie,Hou,Yijun,Tian,Hui,Bai,Xianyong,&Song,Yongliang.(2021).Small-scale Bright Blobs Ejected from a Sunspot Light Bridge.The Astrophysical Journal,908(2).
MLA	Li,Fuyu,et al."Small-scale Bright Blobs Ejected from a Sunspot Light Bridge".The Astrophysical Journal 908.2(2021).

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