High‐resolution observations of naturally enhanced ion acoustic lines and accompanying auroral fine structures
High‐resolution observations of naturally enhanced ion acoustic lines and accompanying auroral fine structures
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自然增强的离子声线和伴随的极光精细结构的高分辨率观测
DOI：
10.1029/2009ja014661
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发表时间：
2010
影响因子：
--
通讯作者：
M. Samara
中科院分区：
文献类型：
--
作者：
R. Michell;M. Samara
[1]我们提出的意见，自然增强的离子声学线（NEIALs）从地面的运动，结合高分辨率极光成像与原始电压样本扑克牌平面非相干散射雷达。我们实现了最大的时间分辨率（12毫秒），采用一个单一的波束位置。确定了四个不同的事件，构成了第一个共同的体积成像仪/NEIAL观察在这种模式下。所有这些都与极光精细结构有关，寿命很短，并且发生在动态发光特征的边界上。它们的存在提供了对现场过程的进一步了解，例如增强的波浪活动，这些过程是使用地面仪器无法观察到的。结合高分辨率光学和雷达观测揭示了NEIAL的时间发展与动态极光精细结构的关系。这些观察结果表明，NEIAL的表现与小于50至100毫秒的时间尺度，提供了一个特定的约束，其生成机制的建模。
[1] We present observations of naturally enhanced ion acoustic lines (NEIALs) from a ground-based campaign, combining high-resolution auroral imaging with raw voltage samples from the Poker Flat Incoherent Scatter Radar. We achieved maximum time resolution (∼12 ms) by employing a single beam position. Four distinct events were identified, constituting the first common-volume imager/NEIAL observations in this mode. All were associated with auroral fine structures, were short-lived, and occurred on the boundaries of dynamic, luminous features. Their presence provides further insight into in situ processes, such as enhanced wave activity, that are otherwise unobservable using ground-based instrumentation. Combined high-resolution optical and radar observations reveal the temporal development of NEIALs in relation to the dynamic auroral fine structures present. These observations indicate that NEIALs manifest with timescales of less than 50 to 100 ms, providing a specific constraint for the modeling of their generation mechanisms.