Oscillations in the solar atmosphere: a result of hydrodynamical simulations.

Details Oscillations in the solar atmosphere: a result of hydrodynamical simulations. Oscillations in the solar atmosphere: a result of hydrodynamical simulations.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...313..971c&link_type=abstract

Astronomy and Astrophysics, v.313, p.971-978

Astronomy and Astrophysics

Astrophysics

11

Hydrodynamics, Waves, Sun: Atmosphere, Chromosphere, Oscillations

Scientific paper

Using a time-dependent hydrodynamic code, we follow the propagation of acoustic waves in the solar atmosphere to study the origin of chromospheric 3 minute oscillations. In the calculations, the spectral analysis method is used and the effects of radiative losses, mechanical heating, thermal conduction and ionization of hydrogen are considered. We found that the observed 3-min oscillations are actually the acoustic waves at periods around 3 minutes which appear as propagating waves (Liu 1984) and become dominant in the chromosphere. We suggest that the 3-min oscillation is caused by an incident acoustic wave spectrum in the 3-min band at the subphotospheric region. The excitation of photospheric 5-min evanescent waves or the shock overtaking process of high frequency waves is minor in the generation of chromospheric 3-min oscillations.

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