Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236..509d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 2, Sept. 1990, p. 509-514.
Astronomy and Astrophysics
Astrophysics
47
Solar Atmosphere, Solar Oscillations, Solar Velocity, Brightness Distribution, Lamb Waves, Photosphere, Solar Spectra, Wave Propagation
Scientific paper
The phase spectra of velocity and brightness perturbations in the quiet photosphere have been studied in the evanescent domain of the k-omega diagram. A regime of low-amplitude evanescent motions, occupying a large sector of the diagnostic diagram bordered by the Lamb and the fundamental mode, has been discovered. This regime forms a continuum in the k-omega plane, in contrast to the 5-min oscillations. Beyond the fundamental mode, it extends to much higher frequencies in between the power ridges of the resonant p-modes. It is suggested that the observed V-I phase is characteristic of evanescent waves, whose progressive part carries energy downward, and that a continuum of such waves is produced through scattering of ordinary resonant p-modes at higher levels in the atmosphere.
Deubner Franz-Ludwig
Fleck Bernard
Marmolino Ciro
Severino Giuseppe
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