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Changes in the subsurface stratification of the Sun with the 11-year activity cycle | | Sandrine Lefebvre
; Alexander Kosovichev
; | | Date: |
5 Oct 2005 | | Subject: | astro-ph | | Abstract: | We report on the changes of the Sun’s subsurface stratification inferred from helioseismology data. Using SOHO/MDI (SOlar and Heliospheric Observatory/Michelson Doppler Imager) data for the last 9 years and, more precisely, the temporal variation of f-mode frequencies, we have computed the variation of the radius of subsurface layers of the Sun by applying helioseismic inversions. We have found a variability of the ``helioseismic’’ radius in antiphase with the solar activity, with the strongest variations of the stratification being just below the surface around 0.995$R_{odot}$. Besides, the radius of the deeper layers of the Sun, between 0.975$R_{odot}$ and 0.99$R_{odot}$ changes in phase with the 11-year cycle. | | Source: | arXiv, astro-ph/0510111 | | Services: | Forum | Review | PDF | Favorites | |
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