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A prospectus for a theory of variable variabilityIt 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.
Document ID
19820009167
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Childress, S. (New York Univ. New York, NY, United States)
Spiegel, E. A. (Columbia Univ. New York, United States)
Date Acquired
August 10, 2013
Publication Date
December 1, 1981
Publication Information
Publication: NASA. Goddard Space Flight Center Variables of the Solar Constants
Subject Category
Solar Physics
Accession Number
82N17041
Funding Number(s)
CONTRACT_GRANT: NSF MCS-79-02766
CONTRACT_GRANT: NSF PHY-77-27086
Distribution Limits
Public
Copyright
Public Use Permitted.

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