Computer Science – Sound
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mmsai..55..135d&link_type=abstract
(European Physical Society, Ministero della Pubblica Istruzione, and Universita di Catania, EPS Study Conference on Oscillations
Computer Science
Sound
7
Power Spectra, Solar Oscillations, Spectral Signatures, Vibration Mode, Phase Velocity, Solar Spectra, Solar Velocity, Sound Waves
Scientific paper
Preliminary results of spectral analyses revealing short-period oscillations of the solar atmosphere are reported. The numerical techniques developed by Endler and Deubner (1983) to compensate for the strongly nonrandom noise signal due to seeing effects in the phase spectra of various Fraunhofer lines are summarized, and synthetic phase spectra are presented and compared with observations. The signatures of running and standing waves at frequencies above 8 mHz are detected, with standing waves most evident in the highest atmospheric layers. Rough estimates based on a simplified model give height difference of about 800 km between the sites of the Mg I 5173-A line and the Fe I 5383-A line and about 3150 km between the site of the Na D(1) line and the reflecting layer. It is inferred that the horizontal magnetic field in this region is too disperse or too weak to affect the short-period acoustic waves.
Deubner Franz-Ludwig
Endler F.
Staiger Joachim
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