A SIMULATION OF CONVECTIVE DYNAMO IN THE SOLAR CONVECTIVE ENVELOPE: MAINTENANCE OF THE SOLAR-LIKE DIFFERENTIAL ROTATION AND EMERGING FLUX
A SIMULATION OF CONVECTIVE DYNAMO IN THE SOLAR CONVECTIVE ENVELOPE: MAINTENANCE OF THE SOLAR-LIKE DIFFERENTIAL ROTATION AND EMERGING FLUX
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DOI：
10.1088/0004-637x/789/1/35
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发表时间：
2014-05
期刊：
影响因子：
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通讯作者：
Yuhong Fan;F. Fang
中科院分区：
文献类型：
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作者：
Yuhong Fan;F. Fang
本文报道了由太阳辐射扩散热流驱动的模型太阳对流包层中对流发电机的磁流体力学模拟结果。对流发电机产生的大尺度平均磁场表现出不规则的周期性行为，振荡时间尺度约为5-15年，并经历不规则的极性反转。平均轴对称环向磁场在两个半球内符号相反，集中在对流区底部。在对流发电机模型中，磁场的存在在自洽维持类太阳差动自转中起着重要作用。在没有磁场的情况下，对流会以较快的旋转极区驱动差异旋转。在磁对流中，我们发现在表面出现了强的超均匀分配磁通束，表现出类似于新出现的太阳活动区的性质。
We report the results of a magnetohydrodynamic (MHD) simulation of a convective dynamo in a model solar convective envelope driven by the solar radiative diffusive heat flux. The convective dynamo produces a large-scale mean magnetic field that exhibits irregular cyclic behavior with oscillation time scales ranging from about 5 to 15 yr and undergoes irregular polarity reversals. The mean axisymmetric toroidal magnetic field is of opposite signs in the two hemispheres and is concentrated at the bottom of the convection zone. The presence of the magnetic fields is found to play an important role in the self-consistent maintenance of a solar-like differential rotation in the convective dynamo model. Without the magnetic fields, the convective flows drive a differential rotation with a faster rotating polar region. In the midst of magneto-convection, we found the emergence of strong super-equipartition flux bundles at the surface, exhibiting properties that are similar to emerging solar active regions.