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Shocklets, SLAMS, and Field-Aligned Ion Beams in the Terrestrial Foreshock

机译:地面前震中的小波,SLAMS和场对准离子束

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摘要

We present Wind spacecraft observations of ion distributions showing field- aligned beams (FABs) and large-amplitude magnetic fluctuations composed of a series of shocklets and short large-amplitude magnetic structures (SLAMS). The FABs are found to have T(sub k) approx 80-850 eV, V(sub b)/V(sub sw) approx 1.3-2.4, T(sub perpendicular,b)/T(sub paralell,b) approx 1-8, and n(sub b)/n(sub o) approx 0.2-11%. Saturation amplitudes for ion/ion resonant and non-resonant instabilities are too small to explain the observed SLAMS amplitudes. We show two examples where groups of SLAMS can act like a local quasi-perpendicular shock reflecting ions to produce the FABs, a scenario distinct from the more-common production at the quasi-perpendicular bow shock. The SLAMS exhibit a foot-like magnetic enhancement with a leading magnetosonic whistler train, consistent with previous observations. Strong ion and electron heating are observed within the series of shocklets and SLAMS with temperatures increasing by factors approx > 5 and approx >3, respectively. Both the core and halo electron components show strong perpendicular heating inside the feature.
机译:我们对离子分布的风飞船观测结果进行了显示,显示了磁场定向束(FAB)和由一系列小波和短大振幅磁结构(SLAMS)组成的大振幅磁涨落。发现FAB的T(sub k)约为80-850 eV,V(sub b)/ V(sub sw)约为1.3-2.4,T(sub vertical,b)/ T(sub paralell,b)约为1 -8,而n(sub b)/ n(sub o)约为0.2-11%。离子/离子共振和非共振不稳定性的饱和幅度太小,无法解释观察到的SLAMS幅度。我们展示了两个示例,其中SLAMS组可以像反射离子的局部准垂直冲击一样产生FAB,这种情况不同于准垂直弓形冲击中更常见的产生。 SLAMS与领先的磁声哨声轮表现出类似脚的磁增强作用,与以前的观察结果一致。在一系列小波和SLAMS中观察到强烈的离子和电子加热,温度分别升高大约5倍和大约3倍。核心和卤素电子组件均在特征内部显示强烈的垂直加热。

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