Solar five-minute oscillations of low, intermediate, and high degree

Antia, H. M. ; Chitre, S. M. ; Narashima, D. (1986) Solar five-minute oscillations of low, intermediate, and high degree Astrophysics and Space Science, 118 (1-7). pp. 169-172. ISSN 0004-640X

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The overstability of acoustic modes trapped inside the Sun is studied with mechanical and thermal effects of turbulence included in an approximate manner through the eddy diffusivities. Many of the acoustic modes are found to be overstable with the most rapidly growing modes occupying a region centred around 3.3 mHz and spread over a wide range of length-scales. The numerical results turn out to be in reasonable accord with the observed power-spectrum of the five-minute oscillations of arbitrary degree. It is demonstrated that these oscillations are most likely to be driven by a simultaneous operation of the κ-mechanism and the convective Cowling mechanism, the dominant contribution to the generation of self-excited acoustic waves arising from the turbulent diffusion.

Item Type:Article
Source:Copyright of this article belongs to Springer-Verlag.
ID Code:12284
Deposited On:10 Nov 2010 05:12
Last Modified:16 May 2016 21:39

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