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Central European Astrophysical Bulletin, Vol. 38 No. 1, 2014.

Conference paper

An Estimate of Chromospheric Heating by Acoustic Waves

Michal Sobotka orcid id orcid.org/0000-0001-5439-7822 ; Astronomical Institute, Academy of Sciences of the Czech Republic, Ondřejov, Czech Republic
Michal Švanda orcid id orcid.org/0000-0002-6345-1007 ; Astronomical Institute, Academy of Sciences of the Czech Republic, Ondřejov, Czech Republic
Jan Jurčak ; Astronomical Institute, Academy of Sciences of the Czech Republic, Ondřejov, Czech Republic
Petr Heinzel ; Astronomical Institute, Academy of Sciences of the Czech Republic, Ondřejov, Czech Republic
D. Del Moro ; Department of Physics, University of Roma Tor Vergata, Rome, Italy
F. Berrilli ; Department of Physics, University of Roma Tor Vergata, Rome, Italy

Full text: english pdf 304 Kb

page 53-58

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Abstract

Several mechanisms may heat the solar chromosphere: acoustic waves, magnetoacoustic waves (slow, fast, and Alfv\'en 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.

Keywords

Sun; chromosphere; heating; waves

Hrčak ID:

143591

URI

https://hrcak.srce.hr/143591

Publication date:

20.11.2014.

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