论文标题
一项自洽的球形发电机中全球磁性螺旋性的研究
A study of global magnetic helicity in self-consistent spherical dynamos
论文作者
论文摘要
磁性螺旋度是理想和电阻磁水动力学的基本约束。使用太阳和其他恒星的磁性螺旋密度的测量来解释产生全局磁场的发电机的内部行为。在本说明中，我们研究了增加复杂性的三种自洽球形发电机解决方案中全局相对磁性螺旋的行为。磁性螺旋性描述了多型和环形磁场（由磁通量加权）的整体连接，我们的结果表明这种链接有首选状态。这使我们提出，全局磁反转也许是保留这种联系的一种手段，因为当只有一个Poloidal或环形场逆转时，首选的链接状态就会丢失。结果表明，磁性螺旋性表明逆转开始，并且可以在外表面观察到这种特征。
Magnetic helicity is a fundamental constraint in both ideal and resistive magnetohydrodynamics. Measurements of magnetic helicity density on the Sun and other stars are used to interpret the internal behaviour of the dynamo generating the global magnetic field. In this note, we study the behaviour of the global relative magnetic helicity in three self-consistent spherical dynamo solutions of increasing complexity. Magnetic helicity describes the global linkage of the poloidal and toroidal magnetic fields (weighted by magnetic flux), and our results indicate that there are preferred states of this linkage. This leads us to propose that global magnetic reversals are, perhaps, a means of preserving this linkage, since, when only one of the poloidal or toroidal fields reverses, the preferred state of linkage is lost. It is shown that magnetic helicity indicates the onset of reversals and that this signature may be observed at the outer surface.
