Physics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981vsc..conf..273c&link_type=abstract
Variations of the Solar Constant, Proceedings of the Conference held 5-7 November 1980 in Greenbelt, MD. Edited by S. Sofia. NAS
Physics
1
Luminosity, Mathematical Models, Oscillations, Solar Constant, Solar Cycles, Stellar Magnetic Fields, Variations, Illuminance, Solar Activity, Solar Physics, Stellar Motions, Theoretical Physics
Scientific paper
It is proposed that the kind of stellar variability exhibited by the Sun in its magnetic activity cycle should be considered as a prototype of a class of stellar variability. The signature includes long 'periods' (compared to that of the radial fundamental model), erratic behavior, and intermittency. As other phenomena in the same variability class we nominate the liminosity fluctuations of ZZ Ceti stars and the solar 160 m oscillation. We discuss the possibility that analogous physical mechanisms are at work in all these cases, namely instabilities driven in a thin layer. These instabilities should be favorable to grave modes (in angle) and should arise in conditions that may allow more than one kind of instability to occur at once. The interaction of these competing instabilities produces complicated temporal variations. Given suitable idealizations, it is shown how to begin to compute solutions of small, but finite, amplitude.
Childress Stephen
Spiegel Edward A.
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