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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Periodicities and Colors of Pulsating Auroras: DSLR Camera Observations From the International Space Station
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Periodicities and Colors of Pulsating Auroras: DSLR Camera Observations From the International Space Station

机译：周期的研究和脉动极光的颜色:单反相机观察国际空间站

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摘要

We investigated the spatial characteristics of pulsating auroras (PsA) using digital camera measurements from the International Space Station. These measurements covered PsEAs in ~5-h wide regions in the magnetic local time (MLT) direction in short time inteErvals ( ~10 min). Analyses of two events suggested that the periodicity of the main pulsation of a PsA does not exhibit any clear dependence on the magnetic latitudEe (63- 66° ) and MLT (00-05). These results suggest that the periods are not controlled by the bounce time of trapped electrons but by local conditions such as gradients of temperature and/or density of electrons near the magnetospheric source region. We also analyzed the colors of PsAs as proxies for the energies of precipitating electrons. The blue and green channels of the digital camera are sensitive to the band emission of molecular nitrogen ions and the green line of oxygen atoms, respectively. Because the energy bands of precipitating electrons producing those two emissions are different, ratios of blue to green (B/G ratios) can be used as proxies for the energies of PsA electrons. The B/G ratio tends to be higher in the morning sector than in the midnight sector, which is consistent with the results of previous studies showing the MLT dependence of the energies of PsA electrons. This capability of estimating the energies of auroral electrons from digital camera images is expected to provide more opportunities for citizen scientists to contribute more deeply to auroral science.
机译：我们调查的空间特征脉动极光(PsA)使用数码相机从国际空间测量站。磁广泛地区当地时间(MLT)方向在短时间内inteErvals(~ 10分钟)。两个事件的分析建议周期性的主要脉动PsA没有表现出任何明确的磁性的依赖latitudEe(63 - 66°)和MLT(00-05)。结果表明,时间不是被困的反弹时间控制电子,而是当地情况等温度梯度和/或密度电子磁性层的源附近的地区。我们也分析了公益广告的颜色作为代理加速电子的能量。蓝色和绿色通道的数码相机分子的敏感波段发射氮离子和氧原子的绿线,分别。沉淀生产这两个电子排放不同,比例的蓝色变为绿色(B / G比率)可以作为代理的能量的PsA电子。早上更高的部门午夜的部门,这是一致的先前的研究显示传输的结果PsA电子的能量的依赖。能力评估极光的能量预计电子从数码相机图像为公民提供更多的机会科学家为极光贡献更深入科学。

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