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arXiv 1102.0235astro-ph.SR
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日震学所见的太阳对流包层底部过冲的更真实的表示

A more realistic representation of overshoot at the base of the solar convective envelope as seen by helioseismology

Joergen Christensen-Dalsgaard, Mario J. P. F. G. Monteiro, Matthias Rempel, Michael J. Thompson

摘要:

太阳对流层底部附近的层结是由对流过冲和元素扩散过程控制的,该区域被广泛认为在太阳发电机中起着关键作用。在该地区的分层引起的太阳能p模式,它已被用来确定太阳能对流区的深度和调查的对流过冲的程度的频率的特征信号。以前的日震调查表明,太阳的球对称分层在这一地区比在一个标准的太阳模型没有过冲平滑,并排除了简单的模型纳入过冲,延长该地区的绝热分层和有一个或多或少的突然过渡到亚绝热分层在边缘的过冲区域。在本文中,我们考虑物理动机的模型,有一个平滑的过渡,在分层桥接该地区从较低的对流区的辐射内部下方。我们发现,这样的模型是在更好的协议与日震数据比标准的太阳模型。

英文摘要:

The stratification near the base of the Sun's convective envelope is governed by processes of convective overshooting and element diffusion, and the region is widely believed to play a key role in the solar dynamo. The stratification in that region gives rise to a characteristic signal in the frequencies of solar p modes, which has been used to determine the depth of the solar convection zone and to investigate the extent of convective overshoot. Previous helioseismic investigations have shown that the Sun's spherically symmetric stratification in this region is smoother than that in a standard solar model without overshooting, and have ruled out simple models incorporating overshooting, which extend the region of adiabatic stratification and have a more-or-less abrupt transition to subadiabatic stratification at the edge of the overshoot region. In this paper we consider physically motivated models which have a smooth transition in stratification bridging the region from the lower convection zone to the radiative interior beneath. We find that such a model is in better agreement with the helioseismic data than a standard solar model.

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