Solar-cycle variation of the sound-speed asphericity from GONG and MDI data 1995-2000

Antia, H. M. ; Basu, S. ; Hill, F. ; Howe, R. ; Komm, R. W. ; Schou, J. (2001) Solar-cycle variation of the sound-speed asphericity from GONG and MDI data 1995-2000 Monthly Notices of the Royal Astronomical Society, 327 (3). pp. 1029-1040. ISSN 0035-8711

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Official URL: http://onlinelibrary.wiley.com/doi/10.1046/j.1365-...

Related URL: http://dx.doi.org/10.1046/j.1365-8711.2001.04819.x

Abstract

We study the variation of the frequency splitting coefficients describing the solar asphericity in both GONG and MDI data, and use these data to investigate temporal sound-speed variations as a function of both depth and latitude during the period 1995-2000 and a little beyond. The temporal variations in even splitting coefficients are found to be correlated to the corresponding component of magnetic flux at the solar surface. We confirm that the sound-speed variations associated with the surface magnetic field are superficial. Temporally averaged results show a significant excess in sound speed around r=0.92 R and latitude of 60°.

Item Type:Article
Source:Copyright of this article belongs to Royal Astronomical Society.
Keywords:Sun: Interior; Sun: Oscillations
ID Code:12464
Deposited On:13 Nov 2010 13:30
Last Modified:16 May 2016 21:48

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