膨胀磁场和太阳风粒子相互作用三维数值模拟

Three-dimension numerical simulation of working process of space plasma sail

采用三维模型,使用混合网格质点法HPIC(Hybrid Particle-in-Cell)对膨胀的磁场和太阳风相互作用过程进行数值模拟.研究了线圈产生的偶极子磁场在注入等离子体后和太阳风粒子的相互作用过程,并对以不同速度入射的等离子体引起的太阳风粒子的变化和磁场变化进行了比较.研究结果表明,偶极子磁场和太阳风作用时会产生弓形激波,此时磁压等于太阳风粒子的动压,当向线圈产生的偶极子磁场中注入高能等离子体时引起磁场膨胀,膨胀的磁场将会排斥太阳风粒子向外运动,从而引起弓形激波的变化,增大与太阳风相互作用的面积,并且粒子入射速度越大,磁场膨胀越明显,与太阳风相互作用愈强.

Using three-dimension model, the hybrid particle in cell method was used to simulate the interaction between the inflated magnetic field and solar wind. The interaction between solar wind particles and dipole magnetic field produced by coil was studied after the plasma injecting into the dipole magnetic field. The changing of solar wind and magnetic field was compared when the plasma was injected with different velocity. It is shown that the bow shock like-structure caused by the interaction between solar wind and dipole magnetic field appears at the area where the magnetic pressure and the dynamic solar wind pressure balance each other. The magnetic field inflates when high-energy density plasma was injected into the dipole magnetic field, then the magnetic field expels the solar wind particles outward. The bow shock like-structure changes and it increases the cross area with the solar wind. It is shown that the bigger the velocity of injected plasma, the more clear the magnetic field inflation and the stronger the interaction with solar wind.