Changes in the Subsurface Stratification of the Sun with the 11-Year Activity Cycle | Zendy

S. Lefebvre | Zendy; А. Г. Косовичев | Zendy

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Changes in the Subsurface Stratification of the Sun with the 11-Year Activity Cycle

Author(s) -

S. Lefebvre,

А. Г. Косовичев

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/498305

Subject(s) - helioseismology , stratification (seeds) , physics , radius , solar radius , doppler effect , observatory , elevation angle , astrophysics , atmospheric sciences , astronomy , solar wind , plasma , coronal mass ejection , seed dormancy , germination , botany , computer security , quantum mechanics , dormancy , magnetic field , computer science , biology , azimuth

We report on the changes of the Sun's subsurface stratification inferred fromhelioseismology data. Using SOHO/MDI (SOlar and HeliosphericObservatory/Michelson Doppler Imager) data for the last 9 years and, moreprecisely, the temporal variation of f-mode frequencies, we have computed thevariation of the radius of subsurface layers of the Sun by applyinghelioseismic inversions. We have found a variability of the ``helioseismic''radius in antiphase with the solar activity, with the strongest variations ofthe 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.Comment: 14 pages, 7 figures, accepted in ApJ

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