| Autor: |
Dominique, Marie, Zhukov, Andrei N., Heinzel, Petr, Dammasch, Ingolf E., Wauters, Laurence, Dolla, Laurent, Shestov, Sergei, Kretzschmar, Matthieu, Machol, Janet, Lapenta, Giovanni, Schmutz, Werner |
| Rok vydání: |
2018 |
| Předmět: |
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| Zdroj: |
The Astrophysical Journal Letters, Vol 867, Iss 2, article id. L24, 2018 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.3847/2041-8213/aaeace |
| Popis: |
We present the first detection of solar flare emission at middle-ultraviolet wavelengths around 2000 A by the channel 2 of the Large-Yield RAdiometer (LYRA) onboard the PROBA2 mission. The flare (SOL20170906) was also observed in the channel 1 of LYRA centered at the H I Lyman-{\alpha} line at 1216 A, 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 10000 K. Simultaneous observations in channels 1 and 2 allow the separation of the line emission (primarily from the Lyman-{\alpha} line) from the Balmer continuum emission. Together with the recent detection of the Balmer continuum emission in the near-ultraviolet by IRIS, the LYRA observations strengthen the interpretation of broadband flare emission as the hydrogen recombination continua originating in the chromosphere. |
| Databáze: |
arXiv |
| Externí odkaz: |
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