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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Pitch angle evolutions of oxygen ions driven by storm time ULF poloidal standing waves
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Pitch angle evolutions of oxygen ions driven by storm time ULF poloidal standing waves

机译：氧离子由螺旋角的演进风暴ULF极向驻波

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We present the first systematic observational study on the pitch angle evolutions of O~+ ions associated with ULF Pc5 poloidal standing waves excited during geomagnetic storms. The O~+ ion measurements are made on board the CLUSTER satellites with the Composition Distribution Function (CODIF) instrument, which covers energies from 1 to 40 keV, a low-energy portion of the ring current. We find that the nature of the ion flux oscillation strongly depends on the magnetic latitude of observation. Near the magnetic equator, the flux oscillation appears only around 0° and 180° pitch angles with no phase delay, which can result from wave-particle interactions in a fundamental mode standing wave with a strong poloidal component. Away from the equator, however, the flux oscillation appears in a wide range of pitch angles with strong pitch angle dispersion that reverses sign from the Southern Hemisphere to the Northern Hemisphere. The latitude dependence of the dispersion signature is explained by combining the ion energy modulation near the equator and the time of flight effect of ion bounce motion. The analysis technique shown in this study can be used to diagnose the field line mode structure of ULF waves.
机译：我们现在第一个系统的观察研究螺旋角演进O ~ +离子与ULF Pc5极向驻波兴奋在地磁风暴。测量是由集群卫星的组成分布函数(CODIF)工具,涵盖从1到40 keV能量,低能量部分的环电流。离子通量振动强烈依赖于磁纬度的观察。磁赤道,通量出现振荡只有大约0°、180°角没有所产生的相位延迟,波粒在一个基本模式中驻波的相互作用有很强的极向组件。然而,赤道流量振荡的出现广泛的俯仰角度,并有很强的音高角度色散逆转的迹象南半球向北半球。分散的纬度的依赖签名是用离子相结合来解释赤道附近的能量调制和时间飞行的离子弹跳运动的影响。本研究分析技术所示用于诊断的字段行模式结构乌尔夫岛上.政治事务

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