Changes in the subsurface stratification of the Sun with the 11-year activity cycle

S. Lefebvre, A. G. Kosovichev

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Abstract

We report on changes in the Sun's subsurface stratification inferred from helioseismology data. Using data from the Solar and Heliospheric Observatory (SOHO) Michelson Doppler Imager (MDI) for the last 9 years and, more precisely, the temporal variation of f-mode frequencies, we have computed the variation in 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⊙. In addition, the radius of the deeper layers of the Sun, between 0.975 and 0.99 R⊙, changes in phase with the 11-year cycle.

Original languageEnglish (US)
Pages (from-to)L149-L152
JournalAstrophysical Journal
Volume633
Issue number2 II
DOIs
StatePublished - Nov 10 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: activity
  • Sun: helioseismology
  • Sun: interior
  • Sun: oscillations

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