论文标题
动态模式分解以检索扭转的alfvén波
Dynamic mode decomposition to retrieve torsional Alfvén waves
论文作者
论文摘要
动态模式分解（DMD）用于识别行星内部产生的固有信号。 Focusing on an axisymmetric quasi-geostrophic magnetohydrodynamic (MHD) wave -called torsional Alfvén waves (TW) - we examine the utility of DMD in two types of MHD direct numerical simulations: Boussinesq magnetoconvection and anelastic convection-driven dynamos in rapidly rotating spherical shells, which model the dynamics in Earth's core and in木星分别。我们证明DMD能够区分内部模式和边界/界面相关模式与内部速度的时间表。这些内部模式可以根据其正常模式解决方案的特征值和特征函数来实现为免费TW。同时，事实证明，为了说明细节，需要进一步解决球形外壳中的全球TW特征值问题。
Dynamic mode decomposition (DMD) is utilised to identify the intrinsic signals arising from planetary interiors. Focusing on an axisymmetric quasi-geostrophic magnetohydrodynamic (MHD) wave -called torsional Alfvén waves (TW) - we examine the utility of DMD in two types of MHD direct numerical simulations: Boussinesq magnetoconvection and anelastic convection-driven dynamos in rapidly rotating spherical shells, which model the dynamics in Earth's core and in Jupiter, respectively. We demonstrate that DMD is capable of distinguishing internal modes and boundary/interface-related modes from the timeseries of the internal velocity. Those internal modes may be realised as free TW, in terms of eigenvalues and eigenfunctions of their normal mode solutions. Meanwhile it turns out that, in order to account for the details, the global TW eigenvalue problems in spherical shells need to be further addressed.
