Mediation of collisionless turbulent dissipation through cyclotron resonance
Mediation of collisionless turbulent dissipation through cyclotron resonance
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DOI：
10.1038/s41550-023-02186-4
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发表时间：
2024-01-23
期刊：
影响因子：
14.1
通讯作者：
Squire，Jonathan
中科院分区：
文献类型：
--
作者：
Bowen，Trevor A.;Bale，Stuart D.;Squire，Jonathan
在从太阳风和日冕到吸积盘和星系团内介质的各种环境中，天体物理系统中的湍流消散是能量转移和加热的基础。虽然湍流耗散在流体力学中被较好地理解，但天体物理等离子体经常表现出奇异的行为，这源于缺乏粒子间碰撞，这使得这些系统中的湍流耗散和加热变得复杂。美国宇航局的帕克太阳探测器任务最近在内日光层进行的观测为离子回旋共振作为湍流消散和等离子体加热的潜在候选者的作用提供了新的线索。在这里，利用对湍流和波群的现场观测，我们证明了离子回旋波为太阳风中的耗散和等离子体加热提供了一条主要途径。我们的结果支持了最近关于内日光层湍流的理论预测，即螺旋度障碍，这表明回旋共振在离子尺度耗散中起到了作用。综上所述，这些结果为天体物理等离子体中的湍流耗散和加速效率提供了重要的约束。
The dissipation of turbulence in astrophysical systems is fundamental to energy transfer and heating in environments ranging from the solar wind and corona to accretion disks and the intracluster medium. Although turbulent dissipation is relatively well understood in fluid dynamics, astrophysical plasmas often exhibit exotic behaviour, arising from the lack of interparticle collisions, which complicates turbulent dissipation and heating in these systems. Recent observations by NASA’s Parker Solar Probe mission in the inner heliosphere have shed new light on the role of ion cyclotron resonance as a potential candidate for turbulent dissipation and plasma heating. Here, using in situ observations of turbulence and wave populations, we show that ion cyclotron waves provide a major pathway for dissipation and plasma heating in the solar wind. Our results support recent theoretical predictions of turbulence in the inner heliosphere, known as the helicity barrier, that suggest a role of cyclotron resonance in ion-scale dissipation. Taken together, these results provide important constraints for turbulent dissipation and acceleration efficiency in astrophysical plasmas.