Weak influence of near-surface layer on solar deep convection zone revealed by comprehensive simulation from base to surface
Weak influence of near-surface layer on solar deep convection zone revealed by comprehensive simulation from base to surface
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DOI：
10.1126/sciadv.aau2307
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发表时间：
2019-01-01
期刊：
影响因子：
13.6
通讯作者：
Kusano, K.
中科院分区：
文献类型：
--
作者：
Hotta, H.;Iijima, H.;Kusano, K.
在高度分层的等离子体中，太阳对流区充满了湍流对流。一些理论和观测研究表明，数值计算高估了对流速度。由于所有的深对流区计算排除了太阳表面，由于大量的时间和空间尺度的分离，太阳表面，驱动热对流与有效的辐射冷却，一直被认为是解决这一矛盾的关键。由于巨型计算机的发展，我们成功地进行了覆盖整个太阳对流区的综合计算。我们比较了有和没有太阳表面在本地域和没有表面在整个球的结果。计算不包括旋转和磁场。地面区域对深对流区的影响出乎意料地弱。我们发现仅仅包括太阳表面并不能解决这个问题。
The solar convection zone is filled with turbulent convection in highly stratified plasma. Several theoretical and observational studies suggest that the numerical calculations overestimate the convection velocity. Since all deep convection zone calculations exclude the solar surface due to substantial temporal and spatial scale separations, the solar surface, which drives the thermal convection with efficient radiative cooling, has been thought to be the key to solve this discrepancy. Thanks to the recent development in massive supercomputers, we are successful in performing the comprehensive calculation covering the whole solar convection zone. We compare the results with and without the solar surface in the local domain and without the surface in the full sphere. The calculations do not include the rotation and the magnetic field. The surface region has an unexpectedly weak influence on the deep convection zone. We find that just including the solar surface cannot solve the problem.