0478686 - ASÚ 2018 RIV FR eng J - Journal Article
Dzifčáková, Elena - Vocks, C. - Dudík, Jaroslav
Synthetic IRIS spectra of the solar transition region: Effect of high-energy tails.
Astronomy & Astrophysics. Roč. 603, July (2017), A14/1-A14/7. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA ČR(CZ) GA16-18495S; GA ČR(CZ) GA17-16447S
Institutional support: RVO:67985815
Keywords : Sun * transition region * UV radiation
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.565, year: 2017

The solar transition region satisfies the conditions for presence of non-Maxwellian electron energy distributions with high-energy tails at energies corresponding to the ionization potentials of many ions emitting in the extreme-ultraviolet and ultraviolet portions of the spectrum. We calculate the synthetic SiIv, OIV, and S IV spectra in the far ultraviolet channel of the Interface Region Imaging Spectrograph (IRIS). Ionization, recombination, and excitation rates are obtained by integration of the cross-sections or their approximations over the model electron distributions considering particle propagation from the hotter corona. The high-energy particles can have significant impact on the emergent spectra and their presence needs to be considered even in situations without strong local acceleration.

Permanent Link: http://hdl.handle.net/11104/0274746