2008
DOI: 10.1016/j.newast.2007.05.003
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Abstract: Due to non-homogeneous mass distribution and non-uniform velocity rate inside the Sun, the solar outer shape is distorted in latitude. In this paper, we analyze the consequences of a temporal change in this figure on the luminosity. To do so, we use the Total Solar Irradiance (TSI) as an indicator of luminosity. Considering that most of the authors have explained the largest part of the TSI modulation with magnetic network (spots and faculae) but not the whole, we could set constraints on radius and effective … Show more

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Cited by 16 publications
(14 citation statements)
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“…If only a rigid rotation in the radiative zone and the differential rotation in the convective zone (Mecheri et al, 2004) are considered, the theoretical value of the solar oblateness is near 9.1 × 10 −6 . In another study, this parameter was found to be between 5.6 × 10 −6 and 8.4 × 10 −6 (Fazel et al, 2008). If the rotation of the core is also considered, the value exceeded 8.4 × 10 −6 (Paterno, Sofia, and di Mauro, 1996).…”
Section: Theoretical Solar Oblatenessmentioning
confidence: 92%
“…If only a rigid rotation in the radiative zone and the differential rotation in the convective zone (Mecheri et al, 2004) are considered, the theoretical value of the solar oblateness is near 9.1 × 10 −6 . In another study, this parameter was found to be between 5.6 × 10 −6 and 8.4 × 10 −6 (Fazel et al, 2008). If the rotation of the core is also considered, the value exceeded 8.4 × 10 −6 (Paterno, Sofia, and di Mauro, 1996).…”
Section: Theoretical Solar Oblatenessmentioning
confidence: 92%
“…Bearing in mind the definition of the energy Eg = −∫(Gm/r) dm, (where r is the radial coordinate and G the gravitation constant) and assuming hydrostatic equilibrium, a thin shell of radius dr containing a mass dm in equilibrium under gravitational and pressure gradient forces will be expanded or contracted if any perturbation of these forces occurs. In [Fazel et al, 2008], the authors improved the method and show that any variations of the size of the solar envelope must be within a few km of amplitude over a Solar Cycle, a value in perfect agreement with those deduced from inversion of the f-modes in helioseismology.…”
Section: How Large Are the Temporal Variations Of The Solar Diameter?mentioning
confidence: 54%
“…Bearing in mind the definition of the energy Eg = −∫(Gm/r) dm, (where r is the radial coordinate and G the gravitation constant) and assuming hydrostatic equilibrium, a thin shell of radius dr containing a mass dm in equilibrium under gravitational and pressure gradient forces will be expanded or contracted if any perturbation of these forces occurs. In [Fazel et al, 2008], the authors improved the method and show that any variations of the size of the solar envelope must be within a few km of amplitude over a Solar Cycle, a value in perfect agreement with those deduced from inversion of the f-modes in helioseismology.The study of the solar oscillation f modes provided by the two space missions SoHO (Solar and Heliospheric Observatory) and SDO [Solar Dynamics Observatory] from 1996 to 2017 has been made by [Kosovichev and Rozelot. 2017] in the scope to analyze the coefficients of rotational frequency splitting -that measure the latitudinal differential rotation-, together with the asphericity coefficients -that gives the profile of the limb shape over the heliographic latitudes- [Reiter et al, 2015].…”
mentioning
confidence: 54%
“…If energy is stored in this reservoir, it will result a change in the Sun's radius, at least in the uppermost layers of the Sun (the leptocline). Recent works show the compatibility of this theory with irradiance variations (Lefebvre and Kosovichev, 2005;Stothers, 2006;Fazel et al, 2008). These mechanisms act at the level of days to several years (cyclic solar activity).…”
Section: The Key Role Of Time Rangingmentioning
confidence: 86%