Abstracts of papers from other journal

✍ Scribed by G. Vassilyeva

• Book ID: 104646283
• Publisher: Springer
• Year: 1975
• Tongue: English
• Weight: 240 KB
• Volume: 43
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00155159

✦ Synopsis

Nonradial g-mode oscillations (g-mode of harmonics /=3 or 4) that are effectively trapped in the solar core are shown to be the most likely candidates for types of motions that could possibly destabilize the Sun. All the acoustic modes, the f-modes, the g-modes of 1_-<2 and the high overtone g-modes do not render overstability, since the radiative damping effect is strong in the region outside the nuclear burning core in which the high temperature-sensitivity of ~He burning tends to destabilize the oscillation. The low overtone g-modes of large l are also excluded by large radiative damping in the nuclear burning core in which they can be trapped. The gradient of the mean molecular weight in the core is effective in providing favorable condition for trapping, especially if short range mixing has enhanced the gradient in a narrow layer. In the latter case, overstability appears to be possible, though marginal. The overstability, if possible, is expected to take place intermittently when the ~He burning is activated. It may have some bearing on the solar neutrino deficiency and on the geological ice ages.