论文标题
迁移的发动机波和恒星电流的后果
Migrating Dynamo Waves and Consequences for Stellar Current Sheets
论文作者
论文摘要
我们研究了恒星发电机传播与恒星磁场的结构之间的关系。通过众所周知的帕克迁移发电机对发电机的建模，我们改变了发电机驱动器的强度，以便获得对赤道的活动波传播（如在太阳能循环中）或对极点。我们使用简单的过渡区域使用简单的耗散磁水动力系统将发电机活性壳中的磁场与周围恒星材料中的磁场匹配。在恒星半球之间引入弱的不对称性，我们研究偶极子，四极杆和八杆磁性成分的相位偏移在距离恒星的各个距离处，以证明元分驱动器中的几个不对称性足以获得Solar Dipole和Quadroupole Moments之间的现实关系。我们研究了恒星电流板的行为，并表明对于极向繁殖活动而言，它与太阳能的行为大不相同。特别是，我们证明了锥形电流板与太阳方向相反的条件。
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.
