Physics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250..235f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 1, Oct. 1991, p. 235-244.
Physics
53
Chromosphere, Solar Oscillations, Solar Physics, Hydrodynamics, Solar Cycles
Scientific paper
The resonant excitation of the acoustic cut-off frequency mode in a stratified atmosphere, an affect which provides a simple explanation of the observed 3-min oscillations of the solar chromosphere, is discussed. It is demonstrated that the cut-off frequency mode is excited also by long period disturbances, which, in the case of the sun, could be the wave trains of the photospheric 5-min oscillations. Due to the spatial attenuation of the evanescent waves, the oscillations at the cut-off frequency dominate the oscillatory signal above a certain height (about 6 to 8 scale heights above the moving piston). The oscillations at the cut-off frequency are very persistent and vanish for t approaches infinity only in an infinitely extended atmosphere without any reflecting boundaries. In a finite atmosphere with an upper boundary at which total or partial reflection occurs, the Omega = 1 oscillations are permanently excited. It is concluded that there is no need for a chromospheric cavity to explain the observed chromospheric 3-min resonance, as was previously assumed.
Fleck Bernard
Schmitz Felix
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