Počet záznamů: 1
Observational study of chromospheric heating by acoustic waves
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SYSNO ASEP 0533785 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Observational study of chromospheric heating by acoustic waves Tvůrce(i) Abbasvand, Vahid (ASU-R) ORCID
Sobotka, Michal (ASU-R) RID, ORCID
Švanda, Michal (ASU-R) RID, ORCID
Heinzel, Petr (ASU-R) RID, ORCID
García-Rivas, Marta (ASU-R) ORCID
Denker, C. (DE)
Balthasar, H. (DE)
Verma, M. (GB)
Kontogiannis, I. (DE)
Koza, J. (SK)
Korda, D. (CZ)
Kuckein, C. (DE)Celkový počet autorů 12 Číslo článku A52 Zdroj.dok. Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361
Roč. 642, October (2020)Poč.str. 10 s. Forma vydání Online - E Jazyk dok. eng - angličtina Země vyd. FR - Francie Klíč. slova Sun ; chromosphere ; oscillations ; radiative transfer Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika Obor OECD Astronomy (including astrophysics,space science) CEP GC18-08097J GA ČR - Grantová agentura ČR GA18-06319S GA ČR - Grantová agentura ČR Způsob publikování Open access Institucionální podpora ASU-R - RVO:67985815 UT WOS 000577102800006 EID SCOPUS 85095115331 DOI 10.1051/0004-6361/202038559 Anotace Our aim is to investigate the role of acoustic and magneto-acoustic waves in heating the solar chromosphere. Observations in strong chromospheric lines are analyzed by comparing the deposited acoustic-energy flux with the total integrated radiative losses. Quiet-Sun and weak-plage regions were observed in the CaII 854.2 nm and H alpha lines with the Fast Imaging Solar Spectrograph (FISS) at the 1.6-m Goode Solar Telescope on 2019 October 3 and in the H alpha and H beta lines with the echelle spectrograph attached to the Vacuum Tower Telescope on 2018 December 11 and 2019 June 6. The deposited acoustic energy flux at frequencies up to 20 mHz was derived from Doppler velocities observed in line centers and wings. Radiative losses were computed by means of a set of scaled non-local thermodynamic equilibrium 1D hydrostatic semi-empirical models obtained by fitting synthetic to observed line profiles. In the middle chromosphere (h = 1000-1400 km), the radiative losses can be fully balanced by the deposited acoustic energy flux in a quiet-Sun region. In the upper chromosphere (h > 1400 km), the deposited acoustic flux is small compared to the radiative losses in quiet as well as in plage regions. The crucial parameter determining the amount of deposited acoustic flux is the gas density at a given height. The acoustic energy flux is efficiently deposited in the middle chromosphere, where the density of gas is sufficiently high. About 90% of the available acoustic energy flux in the quiet-Sun region is deposited in these layers, and thus it is a major contributor to the radiative losses of the middle chromosphere. In the upper chromosphere, the deposited acoustic flux is too low, so that other heating mechanisms have to act to balance the radiative cooling. Pracoviště Astronomický ústav Kontakt Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2021 Elektronická adresa http://hdl.handle.net/11104/0312066
Počet záznamů: 1