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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >The optical manifestation of dispersive field-aligned bursts in auroral breakup arcs
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The optical manifestation of dispersive field-aligned bursts in auroral breakup arcs

机译：色散的光学表现field-aligned爆发在极光弧

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摘要

High-resolution optical observations of a substorm expansion show dynamic auroral rays with surges of luminosity traveling up the magnetic field lines. Observed in ground-based imagers, this phenomenon has been termed auroral flames, whereas the rocket signatures of the corresponding energy dispersions are more commonly known as field-aligned bursts. In this paper, observations of auroral flames obtained at 50 frames/s with a scientific-grade Complementary Metal Oxide Semiconductor (CMOS) sensor (30° × 30° field of view, 30 m resolution at 120 km) are used to provide insight into the nature of the precipitating electrons similar to high-resolution particle detectors. Thanks to the large field of view and high spatial resolution of this system, it is possible to obtain a first-order estimate of the temporal evolution in altitude of the volume emission rate from a single sensor. The measured volume emission rates are compared with the sum of modeled eigenprofiles obtained for a finite set of electron beams with varying energy provided by the TRANSCAR auroral flux tube model. The energy dispersion signatures within each auroral ray can be analyzed in detail during a fraction of a second. The evolution of energy and flux of the precipitation shows precipitation spanning over a large range of energies, with the characteristic energy dropping from 2.1 keV to 0.87 keV over 0.2 s. Oscillations at 2.4 Hz in the magnetic zenith correspond to the period of the auroral flames, and the acceleration is believed to be due to Alfvenic wave interaction with electrons above the ionosphere.
机译：高分辨率光学观察亚暴扩张显示动态极光射线激增磁场的光度旅行行。现象被称为极光火焰,而火箭的签名相应的能量分散更俗称field-aligned破裂。纸,观测获得的极光火焰50帧/ s scientific-grade互补金属氧化物半导体(CMOS)传感器(30°×30°的视野,30 m分辨率在120公里)用于提供洞察的性质沉淀电子相似高分辨率的粒子探测器。大的视野和高空间分辨率这个系统,它可以获得一个一阶估计的时间演化高度的体积发射率单一的传感器。与建模的总和吗eigenprofiles获得的有限集合电子束不同能源提供的TRANSCAR极光磁流管模型。在每个极光射线可以分散签名详细分析期间的一小部分第二。沉淀了沉淀生成了大范围的能量,特点从2.1 keV能量下降到0.87 keV超过0.2年代。在2.4赫兹振荡磁天顶对应的极光火焰,和被认为是由于加速度Alfvenic波相互作用电子上面电离层。

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