迁移发电机波和恒星电流片的后果
Migrating Dynamo Waves and Consequences for Stellar Current Sheets
摘要：
本文研究了恒星发电机波传播与恒星磁场结构之间的关系。发电机波建模著名的帕克迁移发电机，我们改变发电机驱动器的强度，以获得活动波传播向赤道（如在太阳活动周期）或向两极。我们匹配的磁场在发电机活性壳与周围的恒星材料，使用一个简单的耗散磁流体动力学系统的过渡区。引入恒星半球之间的弱不对称性，我们研究的相位偏移的偶极，四极，八极磁组件在不同的距离，从恒星证明百分之几的不对称发电机驱动器是足够的，以获得一个现实的太阳能偶极和四极矩之间的关系。我们研究了恒星电流片的行为，并表明，向极传播活动，它是实质上不同于太阳的。特别是，我们证明了条件下，圆锥形电流片传播相反的太阳方向。
英文摘要：
We study the relation between stellar dynamo-wave propagation and the structure of the stellar magnetic field. Modeling dynamo waves by the well-known Parker migratory dynamo, we vary the intensity of dynamo drivers in order to obtain activity-wave propagation toward the Equator (as in the solar-activity cycle) or towards the Poles. We match the magnetic field in the dynamo active shell with that in the surrounding stellar material, using a simple dissipativ magnetohydrodynamic system for the transition region. Introducing a weak asymmetry between the stellar hemispheres, we study phase shifts of the dipole, quadrupole, and octupole magnetic components at various distances from the star to demonstrate that several-percent asymmetry in dynamo drivers are sufficient to obtain a realistic relation between solar dipole and quadrupole moments. We study the behavior of the stellar current sheets and show that for the poleward propagating activity it is substantially different from solar ones. In particular, we demonstrate conditions in which the conical current sheets propagate opposite to the solar directions.
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