Computer Science – Sound
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...130..331d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 130, no. 2, Jan. 1984, p. 331-340. Research supported by the Institut National
Computer Science
Sound
60
Chromosphere, K Lines, Solar Oscillations, Solar Spectra, Evanescence, Filtergrams, Fine Structure, Gravity Waves, Sound Waves, Specific Heat
Scientific paper
Chromospheric oscillations are investigated with a time sequence of filtergrams of the sun taken in the core of the Ca II K-line at the Sacramento Peak Observatory. The relations between oscillation frequency and wavenumber are analyzed, as are those between frequency and mean intensity. Intensity analysis reveals that low frequency waves are associated mainly with bright (chromospheric network) regions, while the '3-min' oscillation dominates in cell interiors. As the mean brightness of the observed region increases, the high frequency limit of oscillatory power decreases. This is interpreted as the decrease of the resonance frequency of the chromospheric cavity with increasing temperatures, which confirms the chromospheric origin of the 3-min oscillations. Diagnostic diagrams suggest that both acoustic and internal gravity waves occur in the chromosphere and appear to have a modal structure.
Dame Luc
Gouttebroze Pierre
Malherbe Jean-Marie
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