First Detection of Solar Flare Emission in Mid-ultraviolet Balmer Continuum

Autor: Laurence Wauters, Werner Schmutz, Marie Dominique, Ingolf Dammasch, Matthieu Kretzschmar, Petr Heinzel, S. V. Shestov, L. Dolla, Andrei Zhukov, Giovanni Lapenta, Janet Machol
Přispěvatelé: Solar-Terrestrial Centre of Excellence [Brussels] (STCE), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Astronomical Institute of the Czech Academy of Sciences (ASU / CAS), Czech Academy of Sciences [Prague] (CAS), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National d’Études Spatiales [Paris] (CNES), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES)
Jazyk: angličtina
Rok vydání: 2018
Předmět:
IMAGING-SPECTROGRAPH IRIS
010504 meteorology & atmospheric sciences
Astrophysics::High Energy Astrophysical Phenomena
Continuum (design consultancy)
MODELS
FOS: Physical sciences
chromosphere [Sun]
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astronomy & Astrophysics
WHITE-LIGHT FLARE
medicine.disease_cause
01 natural sciences
REGION
symbols.namesake
0103 physical sciences
medicine
Astrophysics::Solar and Stellar Astrophysics
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
0105 earth and related environmental sciences
Physics
UV radiation [Sun]
SPECTRUM
Science & Technology
Solar flare
SUN
Balmer series
Astronomy and Astrophysics
PERFORMANCE
PROBA2
flares [Sun]
RADIOMETER
Astrophysics - Solar and Stellar Astrophysics
RESOLUTION
Space and Planetary Science
[SDU]Sciences of the Universe [physics]
Physics::Space Physics
Physical Sciences
symbols
Ultraviolet
Zdroj: The Astrophysical journal letters
The Astrophysical journal letters, Bristol : IOP Publishing, 2018, 867 (2), pp.L24. ⟨10.3847/2041-8213/aaeace⟩
ISSN: 2041-8205
2041-8213
Popis: © 2018. The American Astronomical Society. All rights reserved. We present the first detection of solar flare emission at mid-ultraviolet wavelengths around 2000 by the channel 2 of the Large-Yield RAdiometer (LYRA) on board the PRoject for OnBoard Autonomy 2 mission. The flare (SOL20170906) was also observed in the channel 1 of LYRA centered at the H i Ly line at 1216 showing a clear non-thermal profile in both channels. The flare radiation in channel 2 is consistent with the hydrogen Balmer continuum emission produced by an optically thin chromospheric slab heated up to 10,000 K. Simultaneous observations in channels 1 and 2 allow the separation of the line emission (primarily from the Ly line) from the Balmer continuum emission. Together with the recent detection of the Balmer continuum emission in the near-ultraviolet by the Interface Region Imaging Spectrometer, the LYRA observations strengthen the interpretation of broadband flare emission as the hydrogen recombination continua originating in the chromosphere. ispartof: ASTROPHYSICAL JOURNAL LETTERS vol:867 issue:2 status: published
Databáze: OpenAIRE
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