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  Small-scale Bright Blobs Ejected from a Sunspot Light Bridge

Li, F., Chen, Y., Hou, Y., Tian, H., Bai, X., & Song, Y. (2021). Small-scale Bright Blobs Ejected from a Sunspot Light Bridge. The Astrophysical Journal, 908(2): 201. doi:10.3847/1538-4357/abd322.

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Genre: Journal Article

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 Creators:
Li, Fuyu, Author
Chen, Yajie1, Author              
Hou, Yijun, Author
Tian, Hui, Author
Bai, Xianyong, Author
Song, Yongliang, Author
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              

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Free keywords: Solar physics; Solar activity; Sunspots; Solar magnetic fields
 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 similar to 10(5) K are commonly observed above LBs in the 1400/1330 A 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 Mm(2). 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 H alpha images taken by the New Vacuum Solar Telescope. The typical temperature and electron density of these blobs are around cm(-3), respectively. The estimated kinetic and thermal energies are on the order of10(22.8) erg and 10(23.3) 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.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/1538-4357/abd322
 Degree: -

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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 908 (2) Sequence Number: 201 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3