Solar Ultraviolet Bursts

0497548 - ASÚ 2020 RIV NL eng J - Článek v odborném periodiku
Young, P. R. - Tian, H. - Peter, H. - Rutten, R.J. - Nelson, C. J. - Huang, Z. - Schmieder, B. - Vissers, G.J.M. - Toriumi, S. - van der Voort, L. H.M.R. - Madjarska, M. S. - Danilović, J. - Berlicki, Arkadiusz - Chitta, L. P. - Cheung, M. C. - Madsen, C. - Reardon, M. W. - Katsukawa, Y. - Heinzel, Petr
Solar Ultraviolet Bursts.
Space Science Reviews. Roč. 214, č. 8 (2018), č. článku 120. ISSN 0038-6308. E-ISSN 1572-9672
Grant CEP: GA ČR(CZ) GA16-18495S
Institucionální podpora: RVO:67985815
Klíčová slova: Sun activity * atmosphere
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 8.142, rok: 2018
Způsob publikování: Open access

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.
Trvalý link: http://hdl.handle.net/11104/0290102