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Astrophysics > Solar and Stellar Astrophysics

arXiv:1805.05850 (astro-ph)
[Submitted on 15 May 2018 (v1), last revised 3 Oct 2018 (this version, v2)]

Title:Solar ultraviolet bursts

Authors:Peter R. Young, Hui Tian, Hardi Peter, Robert J. Rutten, Chris J. Nelson, Zhenghua Huang, Brigitte Schmieder, Gregal J. M. Vissers, Shin Toriumi, Luc H. M. Rouppe van der Voort, Maria S. Madjarska, Sanja Danilovic, Arkadiusz Berlicki, L. P. Chitta, Mark C. M. Cheung, Chad Madsen, Kevin P. Reardon, Yukio Katsukawa, Petr Heinzel
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Abstract:The term "ultraviolet (UV) burst" is introduced to describe small, intense, transient brightenings in ultraviolet images of solar active regions. We inventorize their properties and provide a definition based on image sequences in transition-region lines. Coronal signatures are rare, and most bursts are associated with small-scale, canceling opposite-polarity fields in the photosphere that occur in emerging flux regions, moving magnetic features in sunspot moats, and sunspot light bridges. We also compare UV bursts with similar transition-region phenomena found previously in solar ultraviolet spectrometry and with similar phenomena at optical wavelengths, in particular Ellerman bombs. Akin to the latter, UV bursts are probably small-scale magnetic reconnection events occurring in the low atmosphere, at photospheric and/or chromospheric heights. Their intense emission in lines with optically thin formation gives unique diagnostic opportunities for studying the physics of magnetic reconnection in the low solar atmosphere. This paper is a review report from an International Space Science Institute team that met in 2016-2017.
Comments: Review article accepted for publication in Space Science Reviews
Subjects: Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:1805.05850 [astro-ph.SR]
  (or arXiv:1805.05850v2 [astro-ph.SR] for this version)
  https://doi.org/10.48550/arXiv.1805.05850
Related DOI: https://doi.org/10.1007/s11214-018-0551-0

Submission history

From: Peter Young [view email]
[v1] Tue, 15 May 2018 15:34:49 UTC (762 KB)
[v2] Wed, 3 Oct 2018 22:19:20 UTC (4,451 KB)
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