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

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

2001-09-19

arxiv.org/abs/astro-ph/0109326v1

Mon.Not.Roy.Astron.Soc. 327 (2001) 1029

Astronomy and Astrophysics

Astrophysics

To be published in MNRAS, accepted July 2001

Scientific paper

10.1046/j.1365-8711.2001.04819.x

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 from 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 0.92 solar radii and latitude of 60 degrees.

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