Other
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.286...21m&link_type=abstract
In ESA, Seismology of the Sun and Sun-Like Stars p 21-26 (SEE N89-25819 19-92)
Other
1
Helium, Nuclear Reactions, Solar Gravitation, Solar Oscillations, Combustion, Computerized Simulation, Energy Transfer, Stellar Cores, Stellar Models
Scientific paper
The finite-amplitude behavior of gravity-mode oscillations driven within the deep interior of the Sun was studied by means of a simple idealized model. Such g modes may be self-excited by their ability to extract energy from the nuclear burning of He3 in the core. Both a nonlinear bifurcation analysis and numerical simulations of the behavior of this instability suggest that the growth of He3-driven oscillations is likely to be limited to an amplitude which is insufficient to induce convective instability in the core, a process proposed as a mechanism for core mixing. The numerical results also indicate that if the oscillations are linearly unstable then the degeneracy in linear theory between standing and travelling g modes is broken by nonlinear effects. The oscillations thus develop into a left- or right-travelling wave rather than a standing wave or other superposition of horizontally propagating waves.
Gough Douglas O.
Merryfield William J.
Toomre Juri
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