Modelling Fast-Alfvén Mode Conversion Using SPARC

Eclipse on the Coral Sea: Cycle 24 Ascending

物理学;天文学

Moradi, H.^1 ; Cally, P.S.^1

Monash Centre for Astrophysics, School of Mathematical Sciences, Monash University, VIC 3800, Australia^1

关键词: Background density;    Computational box;    Gravitational stratification;    Helioseismic;    Inclined magnetic fields;    Mode conversions;    Time step;    Upper layer;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/440/1/012047/pdf
DOI  :  10.1088/1742-6596/440/1/012047

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We successfully utilise the SPARC code to model fast-Alfve´n mode conversion in the region cA>>csvia 3-D MHD numerical simulations of helioseismic waves within constant inclined magnetic field configurations. This was achieved only after empirically modifying the background density and gravitational stratifications in the upper layers of our computational box, as opposed to imposing a traditional Lorentz Force limiter, to ensure a manageable timestep. We found that the latter approach inhibits the fast-Alfve´n mode conversion process by severely damping the magnetic flux above the surface.