@inproceedings{5f44b40e9351407a98de41e2cfb7018d,
title = "Helioseismic measurements of solar radius changes from SOHO/MDI",
abstract = "We report on the changes of the Sun's subsurface stratification inferred from helioseismology data. We used SOHO/MDI (SOlar and Heliospheric Observatory/Michelson Doppler Imager) /-mode frequencies and their temporal variation for the last 10 years to compute the variation of the radius in the 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 0.995R⊙. Besides, the radius of the deeper layers of the Sun, between 0.975 R⊙ and 0.99 R ⊙ changes in phase with the 11-year cycle. These results imply a non-homogeneous variation of the radius with depth and time.",
keywords = "Sun: activity, Sun: helioseismology, Sun: interior, Sun: oscillations",
author = "S. Lefebvre and Kosovichev, {A. G.} and Rozelot, {J. P.}",
note = "Funding Information: We thank Drs. Earl Homsher and Theresa Chen for their comments on the manuscript. We appreciate the generosity of Drs. William and Peggy Hamner for instruction on and use of their ExpertVision track- ing system. We also thank Drs. Jim Sellers, Taro Uyeda, James Spu- dich, and David Warshaw for helpful comments on setting up the in vitro motility assay. This work was supported by National Institutes of Health grant AR- 22031 and National Science Foundation grant DMB 89-05363. Doug-las D. Root was supported by a U. S. Public Health Service National Institutional Research Service Award (CA-9056).; SOHO-17: 10 Years of SOHO and Beyond ; Conference date: 07-05-2006 Through 12-05-2006",
year = "2006",
month = jul,
language = "English (US)",
isbn = "9290929286",
series = "European Space Agency, (Special Publication) ESA SP",
number = "617",
booktitle = "Proceedings of SOHO-17",
edition = "617",
}