Plasmaspheric hiss, a whistler-mode emission confined in the high-density plasmasphere, is of great interest to the space community attributed to its important role in inner magnetospheric dynamics. Their frequency-time structures provide crucial evidence for understanding the wave origin. In this work, based on ∼7-year Van Allen Probes data, we statistically studied the frequency-drifting plasmaspheric hiss characterized by an increasing lower cutoff frequency over a timescale exceeding 1 hr. Frequency-drifting hiss waves predominantly occur at 3 < L < 6 from predawn to noon during geomagnetic active times. Observations and theoretical analyses suggest the frequency-drifting hiss could result from the local excitation inside the plasmasphere by energy-dispersive injected electrons. This unique feature of plasmaspheric hiss waves serves, to a certain extent, as an “identifier” for discerning the wave origins and as a “marker” facilitating the link between hiss waves across a broad spatial range.

中文翻译：

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频率漂移等离子体球嘶嘶声：范艾伦探针数据的统计研究

等离子体层嘶嘶声是一种限制在高密度等离子体层中的哨声模式发射，由于其在内磁层动力学中的重要作用，引起了太空界的极大兴趣。它们的频率-时间结构为理解波的起源提供了重要的证据。在这项工作中，基于~7年的范艾伦探测器数据，我们统计研究了频率漂移的等离子体层嘶嘶声，其特征是在超过1小时的时间尺度内截止频率不断增加。频率漂移嘶嘶声波主要发生在  地磁活动期间从黎明前到中午3 < L < 6 的时间段。观察和理论分析表明，频率漂移的嘶嘶声可能是由能量色散注入电子在等离子体层内的局部激发引起的。等离子体层嘶嘶声波的这一独特特征在一定程度上可以作为识别波源的“标识符”，并作为促进广泛空间范围内嘶嘶声波之间联系的“标记”。