Diagnostics of non-thermal-distributions from solar flare EUV line spectra

0537384 - ASÚ 2021 RIV GB eng C - Conference Paper (international conference)
Dzifčáková, Elena - Zemanová, Alena - Dudík, Jaroslav - Lörinčík, Juraj
Diagnostics of non-thermal-distributions from solar flare EUV line spectra.
Solar and Stellar Magnetic Fields: Origins and Manifestations. Cambridge: Cambridge University Press, 2020, s. 414-417. Proceedings of the International Astronomical Union, IAU S354. ISBN 9781108482493. ISSN 1743-9213. E-ISSN 1743-9221.
[Symposium of the International Astronomical Union /354./. Copiapo (CL), 30.06.2019-06.07.2019]
R&D Projects: GA ČR(CZ) GA18-09072S; GA ČR(CZ) GA17-16447S
Institutional support: RVO:67985815
Keywords : Sun * flares * UV radiation
OECD category: Astronomy (including astrophysics,space science)

Spectral line intensities observed by the Extreme Ultraviolet Variability Experiment (EVE) on board the Solar Dynamics Observatory (SDO) during 2012 March 9 M6.3 flare were used to diagnose a presence of a non-thermal electron distribution represented by a κ-distribution. The diagnosed electron densities (≈2×1011cm−3) are affected only a little by the presence of the non-thermal distribution, and are within the uncertainties of observation. On the other hand, the temperature diagnostics based on the line ratios involving different ionization degrees is strongly affected by the type of the electron distribution. The distribution functions diagnosed from relative Fe line intensities demonstrate the presence of strongly non-thermal distributions during the impulsive phase of the flare and later their gradual thermalization.
Permanent Link: http://hdl.handle.net/11104/0315100