The authors suppress spurious oscillations and particle noise in semi-implicit PIC by adding limited Lax-Friedrichs diffusion to the Maxwell solver and computing current in the plasma's moving frame.
Studying dawn-dusk asymmetries of Mercury's magnetotail using MHD-EPIC simulations
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abstract
MESSENGER has observed a lot of dawn-dusk asymmetries in Mercury's magnetotail, such as the asymmetries of the cross-tail current sheet thickness and the occurrence of flux ropes, dipolarization events and energetic electron injections. In order to obtain a global pictures of Mercury's magnetotail dynamics and the relationship between these asymmetries, we perform global simulations with the magnetohydrodynamics with embedded particle-in-cell (MHD-EPIC) model, where Mercury's magnetotail region is covered by a PIC code. Our simulations show that the dawnside current sheet is thicker, the plasma density is larger, and the electron pressure is higher than the duskside. Under a strong IMF driver, the simulated reconnection sites prefer the dawnside. We also found the dipolarization events and the planetward electron jets are moving dawnward while they are moving towards the planet, so that almost all dipolarization events and high-speed plasma flows concentrate in the dawn sector. The simulation results are consistent with MESSENGER observations.
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Suppressing spurious oscillations and particle noise in particle-in-cell simulations
The authors suppress spurious oscillations and particle noise in semi-implicit PIC by adding limited Lax-Friedrichs diffusion to the Maxwell solver and computing current in the plasma's moving frame.