Astronomical Institute of the Czech Academy of Sciences
Natural Sciences (Astrophysics and Astrononmy)
An EST science case concerning the possible heating of solar chromosphere by magneto-acoustic waves is elaborated. The case is based on observations of intensity, polarisation, and Doppler velocity of selected spectral lines with high temporal resolution to detect fluctuations with frequencies up to 40 mHz. The required observing parameters, including the list of proposed spectral lines, together with the tools for velocity and magnetic-field measurements are described. An important point is the determination of time-dependent and time-averaged model atmospheres under the non-LTE conditions in quiet and magnetic regions. These models are used to calculate the energy flux transported by magneto-acoustic waves and net radiative cooling rates at different heights in the atmosphere. Finally, an example of a comparison between acoustic energy fluxes and radiative losses in quiet and magnetised chromosphere is given.
Sobotka et al. 2016, ApJ, 826:49
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