Observations of low wavenumber nonradial eigenmodes of the sun.
Abstract
Photoelectric observations of the photospheric velocity field with high resolution in horizontal wavenumber and frequency have been carried out in the C I 5380-A line. Three or four discrete stable modes of the five-minute oscillations are resolved in the wavenumber-frequency diagram, which agree in many respects with the predicted fundamental modes of subphotospheric standing acoustic waves. Some interesting aspects of the confirmation of a 'global' excitation mechanism of the five-minute oscillations are pointed out. Several apparently discordant details of previous observations are rediscussed, and it is shown that they can be reconciled with the present results.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 1975
- Bibcode:
- 1975A&A....44..371D
- Keywords:
-
- Photoelectric Emission;
- Photosphere;
- Solar Atmosphere;
- Sound Waves;
- Astronomical Models;
- Spatial Distribution;
- Standing Waves;
- Velocity Distribution;
- Solar Physics