2005/10/05 by S. Lefebvre, Sandrine Lefebvre, А. Г. Косовичев +1 · 71 citations
Computer Science · Physics and Astronomy · #Astronomy #Astrophysics #Atmospheric sciences #Coronal mass ejection #Doppler effect #Elevation angle #Helioseismology #Observatory #Physics #Plasma #RADIUS #Solar Radiation and Photovoltaics #Solar and Space Plasma Dynamics #Solar radius #Solar wind #Stellar, planetary, and galactic studies #Stratification (seeds) #astro-ph
paper · pdf · doi:10.1086/498305
published in The Astrophysical Journal 633(2), L149-L152 (IOP Publishing) · 14 pages, 7 figures, accepted in ApJL
arxiv created 2005/10/05 · openalex publication_date 2005/10/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report on changes in the Sun's subsurface stratification inferred from helioseismology data. Using data from the Solar and He lio sphe ric Obs e r va to r y ( 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.