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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Pitch Angle Phase Shift in Ring Current Ions Interacting With Ultra-Low-Frequency Waves: Van Allen Probes Observations
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Pitch Angle Phase Shift in Ring Current Ions Interacting With Ultra-Low-Frequency Waves: Van Allen Probes Observations

机译：螺旋角环电流离子相移Ultra-Low-Frequency波相互作用:范艾伦探针观察

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摘要

Drift-bounce resonance between ultra-low-frequency (ULF) waves and ring current ions has been widely studied, because of its important role in ring current acceleration and relevant geomagnetic activities. To identify drift-bounce resonance in observations, 180° phase shifts across resonant pitch angle have been proposed as diagnostic signatures. This study, however, presents observations that suggest this criterion may be invalid when phase space density (PSD) distributions vary nonmonochromatically with energy. We identified 14 ULF wave-ion interaction cases from 2-years Van Allen Probes data. In these cases, 180° phase shifts across pitch angle are observed at particular energies. Near these energies, pitch angle-dependent PSD bump-on-tail distributions were also observed. As a result, at fixed energies, the sign of ion PSD energy gradient changes across pitch angle, which then can result in the observed 180° phase shift. Based on the observations, we suggest 180° phase shifts across pitch angle can also result from pitch angle-dependent bump-on-tail distributions, which should be taken into account in future ULF wave-ion interaction studies.
机译：Drift-bounce ultra-low-frequency之间的共振(ULF)波和环电流离子广泛在环研究,由于其重要的作用当前加速度和地磁相关活动。观察,180°相移谐振螺旋角提出了诊断签名。观察结果表明这一标准无效的时相空间密度(PSD)分布不同nonmonochromatically与能量。情况下从中国开放范艾伦辐射探测数据。这些病例中,有180°相移在螺距角观察到特定的能量。能量,音高angle-dependent PSD bump-on-tail分布也被观察到。固定的能量,离子能量PSD的标志梯度变化在螺旋角,然后会导致观察到180°相移。根据观察,我们建议180°的阶段螺旋角也能引起对面转变距angle-dependent bump-on-tail分布,应该考虑在未来的ULFwave-ion交互的研究。

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