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首页> 外文期刊>The Astrophysical journal >GRAIN ACCELERATION BY MAGNETOHYDRODYNAMIC TURBULENCE: GYRORESONANCE MECHANISM
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GRAIN ACCELERATION BY MAGNETOHYDRODYNAMIC TURBULENCE: GYRORESONANCE MECHANISM

机译:磁流体动力学湍流加速:共振机制

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We discuss a new mechanism of dust acceleration that acts in a turbulent magnetized medium. The magneto-hydrodynamic (MHD) turbulence includes both fluid motions and magnetic fluctuations. We show that while the fluid motions bring about grain motions through the drag, the electromagnetic fluctuations can accelerate grains through resonant interactions. In this Letter, we calculate the grain acceleration by the gyroresonance in the cold neutral medium. We consider both incompressible and compressible MHD modes. We show that fast modes dominate the grain acceleration. For the parameters chosen, fast modes render to grains supersonic velocities that may shatter the grains and enable the efficient absorption of heavy elements. Since the grains are preferentially accelerated with large pitch angles, the supersonic grains get aligned with long axes perpendicular to the magnetic field.
机译:我们讨论了一种在湍流磁化介质中起作用的粉尘加速的新机制。磁流体动力学(MHD)湍流包括流体运动和磁波动。我们表明,虽然流体运动通过阻力引起晶粒运动,但电磁波动可以通过共振相互作用使晶粒加速。在这封信中,我们通过冷中性介质中的回旋共振来计算晶粒加速。我们考虑不可压缩和可压缩的MHD模式。我们表明,快速模式主导着晶粒的加速。对于选定的参数,快速模式使晶粒具有超音速,这可能会使晶粒破碎并有效吸收重元素。由于晶粒优选以大的俯仰角加速,因此超音速晶粒与垂直于磁场的长轴对齐。

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