Počet záznamů: 1  

An Estimate of Chromospheric Heating by Acoustic Waves

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    0456565 - ASÚ 2016 RIV HR eng J - Článek v odborném periodiku
    Sobotka, Michal - Švanda, Michal - Jurčák, Jan - Heinzel, Petr - Del Moro, D. - Berrilli, F.
    An Estimate of Chromospheric Heating by Acoustic Waves.
    Central European Astrophysical Bulletin. Roč. 38, č. 1 (2014), s. 53-58. ISSN 1845-8319
    Grant CEP: GA ČR(CZ) GA14-04338S; GA ČR GPP209/12/P568; GA ČR GAP209/12/0287
    Institucionální podpora: RVO:67985815
    Klíčová slova: Sun * chromosphere * heating
    Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika

    Several mechanisms may heat the solar chromosphere: acoustic waves, magnetoacoustic waves (slow, fast, and Alfvén waves), and small-scale magnetic reconnections. Based on observations in the Ca II 854.2 nm line, the contribution of acoustic waves to the heating of quiet and plage regions in the chromosphere is discussed. The energy released by radiative losses is compared with the energy deposited by acoustic waves. Radiative losses are computed using a grid of six semi-empirical models VAL A--F. The deposited acoustic flux is calculated using power spectra of Doppler oscillations measured in the Ca~II line core. The comparison shows that the spatial correlation of maps of radiative losses and acoustic flux is 70 %. The deposited acoustic flux provides at least 25--30~% of the energy radiated in the quiet chromosphere and 50~% in plage regions.
    Trvalý link: http://hdl.handle.net/11104/0257095

     
     
Počet záznamů: 1  

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