Computer Science – Sound
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...213..423d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 213, no. 1-2, April 1989, p. 423-428.
Computer Science
Sound
64
Convection, Gravity Waves, Photosphere, Solar Atmosphere, Time Series Analysis, Solar Granulation, Sound Waves
Scientific paper
A time series of simultaneously measured velocity (V) and intensity (I) fluctuations of different spectral lines formed in the photosphere and low chromosphere is analyzed. In order to separate the different patterns of motions, V-V and V-I phase difference spectra have been computed not only with respect to frequency but also to the horizontal wavenumber. The V-V phase difference spectra of the Na D1 line and two photospheric Fe I lines clearly show the existence of gravity waves in the solar atmosphere. The V-I phase spectra also exhibit the behavior of gravity waves at high wavenumbers. At low wavenumbers one finds positive V-I phase differences. This is taken as an indication for convective motions with a typical spatial scale of more than 5 arcsec (mesogranulation).
Deubner Franz-Ludwig
Fleck Bernard
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