Inversions of the Ledoux discriminant: a closer look at the tachocline
Inversions of the Ledoux discriminant: a closer look at the tachocline
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DOI：
10.1093/mnrasl/slx139
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发表时间：
2017-09
影响因子：
4.8
通讯作者：
G. Buldgen;S. Salmon;M. Godart;A. Noels;R. Scuflaire;M. Dupret;D. Reese;J. Colgan;C. Fontes;P. Eggenberger;P. Hakel;D. Kilcrease;O. Richard
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文献类型：
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作者：
G. Buldgen;S. Salmon;M. Godart;A. Noels;R. Scuflaire;M. Dupret;D. Reese;J. Colgan;C. Fontes;P. Eggenberger;P. Hakel;D. Kilcrease;O. Richard
模拟太阳对流层的底部是一个繁琐的问题。自从第一次自转反转以来，太阳模型研究者面临着这样一个事实，即一个非常有限的区域对太阳产生了巨大的物理影响。事实上，它是从微分旋转到固体旋转的过渡区域，速跃层，它还受到湍流的影响，也被认为是太阳磁发电机的所在地。此外，太阳模型显示出与该区域声速剖面的显著差异。在本文中，我们将展示如何日震学可以提供进一步的限制，这一地区进行反演的勒杜判别式。我们比较了这些反演的标准太阳模型使用不同的不透明度表和化学丰度，并讨论了太阳模型和太阳之间的差异的起源。
Modelling the base of the solar convective envelope is a tedious problem. Since the first rotation inversions, solar modellers are confronted with the fact that a region of very limited extent has an enormous physical impact on the Sun. Indeed, it is the transition region from differential to solid body rotation, the tachocline, which furthermore is influenced by turbulence and is also supposed to be the seat of the solar magnetic dynamo. Moreover, solar models show significant disagreement with the sound speed profile in this region. In this paper, we show how helioseismology can provide further constraints on this region by carrying out an inversion of the Ledoux discriminant. We compare these inversions for Standard Solar Models built using various opacity tables and chemical abundances and discuss the origins of the discrepancies between Solar Models and the Sun.