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首页> 外文期刊>Chinese Journal of Astronomy and Astrophysics >Proton and He~(2+) Temperature Anisotropies in the Solar Wind Driven by Ion Cyclotron Waves
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Proton and He~(2+) Temperature Anisotropies in the Solar Wind Driven by Ion Cyclotron Waves

机译:离子回旋波驱动的太阳风中质子和He〜(2+)温度各向异性

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摘要

We carried out one-dimensional hybrid simulations of resonant scattering of protons and He~(2+) ions by ion cyclotron waves in an initially homogeneous, collisionless and magnetized plasma. The initial ion cyclotron waves have a power spectrum and propagate both outward and inward. Due to the resonant interaction with the protons and He~(2+) ions, the wave power will be depleted in the resonance region. Both the protons and He~(2+) ions can be resonantly heated in the direction perpendicular to the ambient magnetic field and leading to anisotropic velocity distributions, with the anisotropy higher for the He~(2+) ions than for the protons. At the same time, the anisotropies of the protons and He~(2+) ions are inversely correlated with the plasma β_(‖p) = 87πn_pk_BT_(‖p)/B_0~2, consistent with the prediction of the quasilinear theory (QLT).
机译:我们在最初均匀,无碰撞和磁化的等离子体中,通过离子回旋波对质子和He〜(2+)离子的共振散射进行了一维混合模拟。初始离子回旋波具有功率谱,并且向外和向内传播。由于与质子和He〜(2+)离子的共振相互作用,波功率将在共振区域中耗尽。质子和He〜(2+)离子都可以在垂直于环境磁场的方向上共振加热,并导致各向异性的速度分布,其中He〜(2+)离子的各向异性高于质子。同时,质子和He〜(2+)离子的各向异性与等离子体β_(′p)=87πn_pk_BT_(′p)/ B_0〜2成反比,与准线性理论(QLT)的预测一致)。

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