The acoustic overstability in a polytropic plane-parallel atmosphere with superadiabatic temperature gradient and radiative dissipation is demonstrated for optically thick disturbances. The periods of oscillation are found to be in the range 250-480 s and the associated wavelength of the order of 40
Trapped gravity waves and the five-minute oscillations of the solar atmosphere
✍ Scribed by John H. Thomas; Patricia André Clark; Alfred Clark
- Publisher
- Springer
- Year
- 1971
- Tongue
- English
- Weight
- 752 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0038-0938
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
The 5-min oscillations in the photospheric velocity fields have been studied in detail from measurements on 14 absorption lines from three time sequences of spectrograms of high quality. The lines cover a range of heights in the solar atmosphere from log z = + 0.2 to --1.2. Regions oscillating coher
The radiative damping of trapped gravity waves in an optically thin atmosphere is studied for a stratified Boussinesq fluid. The character of the atmospheric eigenmodes depends on the distribution of the Brunt-V~iis~il/i frequency N and the radiative relaxation time r. The calculations for simple la
This paper presents a detailed discussion of the properties of linear, periodic acoustic waves that propagate vertically in a non-isothermal atmosphere. In order to retain the basic feature of the solar atmosphere we have chosen a temperature profile presenting a minimum. An analytical solution of t