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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Ion-ScaleWave Properties and Enhanced Ion Heating Across the Low-Latitude Boundary Layer During Kelvin-Helmholtz Instability
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Ion-ScaleWave Properties and Enhanced Ion Heating Across the Low-Latitude Boundary Layer During Kelvin-Helmholtz Instability

机译：Ion-ScaleWave属性和增强离子加热在中低纬度边界层Kelvin-Helmholtz不稳定

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摘要

In the Earth's magnetosphere, the magnetotail plasma sheet ions are much hotter than in the shocked solar wind. On the dawn sector, the cold-component ions are more abundant and hotter by 30-40% when compared to the dusk sector. Recent statistical studies of the flank magnetopause and magnetosheath have shown that the level of temperature asymmetry of the magnetosheath is unable to account for this, so additional physical mechanisms must be at play, either at the magnetopause or plasma sheet that contributes to this asymmetry. In this study, we perform a statistical analysis on the ion-scale wave properties in the three main plasma regimes common to flank magnetopause boundary crossings when the boundary is unstable to Kelvin-Helmholtz instability (KHI): hot and tenuous magnetospheric,cold and dense magnetosheath, and mixed (Hasegawa et al., 2004). These statistics of ion-scale wave properties are compared to observations of fast magnetosonic wave modes that have recently been linked to Kelvin-Helmholtz (KH) vortex centered ion heating (Moore et al., 2016). The statistical analysis shows that during KH events there is enhanced nonadiabatic heating calculated during ion scale wave intervals when compared to non-KH events. This suggests that during KH events there is more free energy for ion-scale wave generation, which in turn can heat ions more effectively when compared to cases when KH waves are absent. This may contribute to the dawn favored temperature asymmetry of the plasma sheet; recent studies suggest KH waves favor the dawn flank during Parker-Spiral interplanetary magnetic field.
机译：在地球的磁气圈,磁尾等离子体单离子的温度比得多震惊了太阳风。cold-component离子更丰富和更热由30 - 40%相比,黄昏部门。最近统计的研究侧面磁和磁鞘显示温度不对称的水平磁鞘无法解释这个,所以额外的物理机制必须在起作用,在磁层或等离子表导致这种不对称。对ion-scale执行统计分析三个主要的等离子体波属性机制常见的侧面磁层边界过境点当Kelvin-Helmholtz的边界是不稳定的不稳定(地块):热,脆弱的磁性层的、寒冷和密集的磁鞘和混合(长谷川et al ., 2004)。ion-scale波属性进行比较观察快磁声波模式最近有关Kelvin-Helmholtz吗(KH)涡中心离子加热(摩尔et al .,2016)。KH事件有增强的非绝热加热计算离子尺度波间隔期间相比non-KH事件。在KH事件有更多的免费能源ion-scale波生成,进而可以加热离子相比更有效的情况下KH缺席。黎明青睐等离子体的温度不对称表;黎明在Parker-Spiral星际侧面磁场。

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