Chromospheric Heating by Acoustic Waves Compared to Radiative Cooling. II. Revised Grid of Models

0533755 - ASÚ 2021 RIV US eng J - Článek v odborném periodiku
Abbasvand, Vahid - Sobotka, Michal - Heinzel, Petr - Švanda, Michal - Jurčák, Jan - Del Moro, D. - Berrilli, F.
Chromospheric Heating by Acoustic Waves Compared to Radiative Cooling. II. Revised Grid of Models.
Astrophysical Journal. Roč. 890, č. 1 (2020), č. článku 22. ISSN 0004-637X. E-ISSN 1538-4357
Grant CEP: GA ČR(CZ) GC18-08097J
Institucionální podpora: RVO:67985815
Klíčová slova: lambda iteration method * solar chromosphere * resolution
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.877, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.3847/1538-4357/ab665f

Acoustic and magnetoacoustic waves are considered to be possible agents of chromospheric heating. We present a comparison of deposited acoustic energy flux with total integrated radiative losses in the middle chromosphere of the quiet Sun and a weak plage. The comparison is based on a consistent set of high-resolution observations acquired by the Interferometric Bidimensional Spectrometer instrument in the Ca II 854.2 nm line. The deposited acoustic-flux energy is derived from Doppler velocities observed in the line core and a set of 1737 non-local thermodynamic equilibrium 1D hydrostatic semi-empirical models, which also provide the radiative losses. The models are obtained by scaling the temperature and column mass of five initial models by Vernazza et al. (1981, VAL) B-F to get the best fit of synthetic to observed profiles. We find that the deposited acoustic-flux energy in the quiet-Sun chromosphere balances 30%-50% of the energy released by radiation. In the plage, it contributes by 50%-60% in locations with vertical magnetic field and 70%-90% in regions where the magnetic field is inclined more than 50 degrees to the solar surface normal.
Trvalý link: http://hdl.handle.net/11104/0312140