Seismology of the solar envelope: sound-speed gradient in the convection zone and its diagnosis of the equation of state

Citation
Va. Baturin et al., Seismology of the solar envelope: sound-speed gradient in the convection zone and its diagnosis of the equation of state, M NOT R AST, 316(1), 2000, pp. 71-83
Citations number
46
Categorie Soggetti
Space Sciences
Journal title
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN journal
00358711 → ACNP
Volume
316
Issue
1
Year of publication
2000
Pages
71 - 83
Database
ISI
SICI code
0035-8711(20000721)316:1<71:SOTSES>2.0.ZU;2-N
Abstract
We report the results of an asymptotic inversion of solar oscillation data for the gradient of the sound speed in the convection zone. This gradient r eveals derails of;he non-ideal Coulomb interactions between particles, incl uding pressure ionization, A simplified physical model is used to track dow n the effect of various physical assumptions in the sound-speed derivative, The model contains a calibration for the size of the H and He atoms and th e He+ ion. We find that, for the pressure-ionization regions of hydrogen an d helium, such a model matches the data better than any of the currently av ailable parameter-free theories.