Wauters, Laurence ; Dominique, Marie ; Dammasch, Ingolf ; Kretzschmar, Matthieu

Talk presented at 48th SPD meeting, Portland on 2017-08-22

Abstract: Lyman-alpha (121.6 nm) is an optical thick line mostly formed in the chromosphere. Although one of the strongest lines of the solar spectrum, there are very few reports of solar flare signatures in Lyman-alpha and the few observations available differ significantly in shape, time duration and amplitude. Consequently, the fraction of non-thermal energy deposited during solar flares in this wavelength is still subject to discussion. The LYRA experiment is a radiometer on board the PROBA2 spacecraft launched in 2009. LYRA is composed of three identical units (one nominal, two backups), which each includes four distinct broadband channels, among which one covering Lyman-alpha. Despite the fact that the LYRA Lyman-alpha signal has degraded quickly at the beginning of the mission in the nominal channel, it observed about ten flares. Additionally, one more flare was observed in one of the backup channels. In this talk, we will analyse this particular flare profile and compare it to other instruments including Goes-15, EVE/MEGS-P, LYRA Zirconium channel.

Keyword(s): LYRA ; Flare ; Filament eruption
Note: Marie Dominique presented this talk, Laurence Wauters was under seak leave
Links: link
Funding: PROBA2/PROBA2/PROBA2