Impact of magnetohydrodynamic turbulence on thermal wind balance in the Sun
Impact of magnetohydrodynamic turbulence on thermal wind balance in the Sun
复制标题
磁流体动力湍流对太阳热风平衡的影响
DOI：
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复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Y. Masada
中科院分区：
文献类型：
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作者：
Y. Masada
基于线性和非线性理论结合物理参数研究了磁旋转不稳定性（MRI）及其驱动的磁流体动力学（MHD）湍流在太阳内部的可能作用，假设太阳自转剖面由日震观测反演，太阳内部结构采用标准模型.我们发现MRI的位置仅限于较高纬度的速度跃层和较低纬度的近地表剪切层。特别有趣的是，在速跃层周围的MRI活跃区域与指示熵急剧上升的区域密切重叠，这是太阳热风平衡所必需的。这表明MRI驱动的湍流通过异常的湍流加热和向赤道的角动量传输在维持太阳热成风平衡方面起着至关重要的作用。在速跃层周围存在的暖极可能是MRI激发的湍流活动的自然结果。
The possible role of magnetorotational instability (MRI) and its driven magnetohydrodynamic (MHD) turbulence in the solar interior is studied on the basis of linear and non-linear theories coupled with physical parameters, assuming a solar rotation profile inverted from helioseismic observations and a standard model for the internal structure of the Sun. We find that the location of MRI is confined to the higher latitude tachocline and lower latitude near-surface shear layer. It is especially interesting that the MRI-active region around the tachocline closely overlaps with the area indicating a steep entropy rise, which is required from the thermal wind balance in the Sun. This suggests that the MRI-driven turbulence plays a crucial role in maintaining the thermal wind balance in the Sun via the exceptional turbulent heating and equatorward angular momentum transport. The warm pole existing around the tachocline might be a natural outcome of the turbulent activities energized by the MRI.
DOI：
10.1111/j.1365-2966.2009.15464.x
发表时间：
2009-07
影响因子：
4.8
作者：
S. Balbus;S. Balbus;Julius Bonart;H. Latter;N. Weiss
通讯作者：
S. Balbus;S. Balbus;Julius Bonart;H. Latter;N. Weiss