0547574 - ASÚ 2022 RIV FR eng J - Journal Article
Abbasvand, Vahid - Sobotka, Michal - Švanda, Michal - Heinzel, Petr - Liu, Wenjuan - Mravcová, L.
IRIS observations of chromospheric heating by acoustic waves in solar quiet and active regions.
Astronomy & Astrophysics. Roč. 648, April (2021), č. článku A28. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA ČR(CZ) GC18-08097J
Institutional support: RVO:67985815
Keywords : Sun * chromosphere * oscillationsradiative transfer
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.240, year: 2021
Method of publishing: Open access with time embargo
https://doi.org/10.1051/0004-6361/202140344

To study the heating of solar chromospheric magnetic and nonmagnetic regions by acoustic and magnetoacoustic waves, the deposited acoustic-energy flux derived from observations of strong chromospheric lines is compared with the total integrated radiative losses.
Observed waves propagate upward at supersonic speed. In the quiet chromosphere, the deposited acoustic flux is sufficient to balance the radiative losses and maintain the semi-empirical temperatures in the layers under study. In the active-region chromosphere, the comparison shows that the contribution of acoustic-energy flux to the radiative losses is only 10-30%.Conclusions. Acoustic and magnetoacoustic waves play an important role in the chromospheric heating, depositing a main part of their energy in the chromosphere. Acoustic waves compensate for a substantial fraction of the chromospheric radiative losses in quiet regions. In active regions, their contribution is too small to balance the radiative losses and the chromosphere has to be heated by other mechanisms.
Permanent Link: http://hdl.handle.net/11104/0323783