Year: 2018
Type: book-chapter
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.
Source: Space Science Reviews
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
Institutions: Goddard Space Flight Center, George Mason University, Northumbria University, Peking University, Max Planck Institute for Solar System Research, University of Oslo, Queen's University Belfast, University of Sheffield, Shandong University, Centre National de la Recherche Scientifique, Université Paris Sciences et Lettres, Observatoire de Paris, Sorbonne Paris Cité, Laboratoire d’études spatiales et d’instrumentation en astrophysique, Stockholm University, AlbaNova, National Astronomical Observatory of Japan, University of Wrocław, Czech Academy of Sciences, Astronomical Institute, Lockheed Martin (United States), Boston University, Center for Astrophysics Harvard & Smithsonian, Arcetri Astrophysical Observatory, National Solar Observatory, National Institute for Astrophysics
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $5,290
Awards: G1210760574, DISCOVERING AND CHARACTERIZING THE FUNDAMENTAL PROCESSES OCCURRING WITHIN THE HELIOSPHERE IS ONE OF THE FOUR HIGH LEVEL SCIENCE GOALS OF THE HELIOPHY, From the Sun to the Stars: Building of a Universal Theory of Spots and Flares Based on Numerical and Observational Studies, Approach to understand the solar coronal and chromospheric heating --- from Hinode, IRIS & CLASP to SOLAR-C, High Precision Polarimetric Observation by a Balloon-Borne Solar Telescope: Revealing Conversion Processes of Magnetic Energy in the Stellar Atmosphere, G87852061
OpenAlex ID: W2803606467