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Solar differential rotation reproduced with high-resolution simulation
Nature Astronomy ( IF 14.1 ) Pub Date : 2021-09-13 , DOI: 10.1038/s41550-021-01459-0
H. Hotta 1 , K. Kusano 2
Affiliation  

The Sun rotates differentially with a fast equator and slow pole1. Convection in the solar interior is thought to maintain the differential rotation. However, although many numerical simulations have been conducted to reproduce the solar differential rotation2,3,4,5,6,7, previous high-resolution calculations with solar parameters fall into the antisolar (fast-pole) differential rotation regime. Consequently, we still do not know the true reason why the Sun has a fast-rotating equator. While the construction of the fast equator requires a strong rotational influence on the convection, the previous calculations have not been able to achieve the situation without any manipulations. The problem is called the convective conundrum8. The convection and the differential rotation in numerical simulations were different from the observations. Here, we show that a high-resolution calculation succeeds in reproducing the solar-like differential rotation. Our calculations indicate that the strong magnetic field generated by a small-scale dynamo has a significant impact on thermal convection. The successful reproduction of the differential rotation, convection and magnetic field achieved in our calculation is an essential step to understanding the cause of the most basic nature of solar activity, specifically, the 11 yr cycle of sunspot activity.



中文翻译:

用高分辨率模拟再现太阳差速旋转

太阳以快赤道和慢极1不同地旋转。太阳内部的对流被认为维持了差速旋转。然而,尽管已经进行了许多数值模拟来重现太阳差速旋转2,3,4,5,6,7,但以前使用太阳参数的高分辨率计算属于反太阳(快极)差速旋转状态。因此,我们仍然不知道太阳有一个快速旋转的赤道的真正原因。虽然快赤道的构造需要对对流产生强烈的旋转影响,但之前的计算在没有任何操作的情况下无法实现这种情况。这个问题被称为对流难题8. 数值模拟中的对流和微分旋转与观察结果不同。在这里,我们展示了高分辨率计算成功地再现了类似太阳的差速旋转。我们的计算表明,小型发电机产生的强磁场对热对流有显着影响。在我们的计算中成功再现了差动旋转、对流和磁场,是了解太阳活动最基本性质的原因,特别是太阳黑子活动的 11 年周期的关键步骤。

更新日期:2021-09-13
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