Observations of the auroral width spectrum at kilometre-scale size
Observations of the auroral width spectrum at kilometre-scale size
复制标题
公里级极光宽度谱的观测
DOI：
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发表时间：
2010
期刊：
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通讯作者：
Z. Kryzanowsky
中科院分区：
文献类型：
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作者：
N. Partamies;M. Syrjäsuo;E. Donovan;M. Connors;D. Charrois;D. Knudsen;Z. Kryzanowsky
抽象。本研究探讨极光彩色相机数据从加拿大密集阵列成像系统（DAISY）。密集阵列由三个成像器组成，它们具有不同的窄视场（与全天空视图相比）光学器件。主要的科学动机来自Knudsen等人（2001年）的早期研究，他们使用全天空成像仪（ASI）结合甚至更早的电视摄像机观察（Maggs和Davis，1968年），表明极光弧宽度分布在1公里左右存在差距。通过DAISY观测，我们能够证明差距是仪器伪影，并且是由于空间分辨率和常用仪器（即ASI和电视摄像机）的覆盖范围有限。如果极光尺度谱确实是连续的，那么形成这些结构的机制应该能够产生所有不同的尺度。到目前为止，文献中还没有提出这样一个单一的过程，而且很少有模型被设计成相互作用，即使它们的有利条件范围确实重叠。在今后的极光形式和电子加速区的研究中，无论是观测方法还是理论方法，都应考虑所有尺度的大小。
Abstract. This study examines auroral colour camera data from the Canadian Dense Array Imaging SYstem (DAISY). The Dense Array consists of three imagers with different narrow (compared to all-sky view) field-of-view optics. The main scientific motivation arises from an earlier study by Knudsen et al. (2001) who used All-Sky Imager (ASI) combined with even earlier TV camera observations (Maggs and Davis, 1968) to suggest that there is a gap in the distribution of auroral arc widths at around 1 km. With DAISY observations we are able to show that the gap is an instrument artifact and due to limited spatial resolution and coverage of commonly used instrumentation, namely ASIs and TV cameras. If the auroral scale size spectrum is indeed continuous, the mechanisms forming these structures should be able to produce all of the different scale sizes. So far, such a single process has not been proposed in the literature and very few models are designed to interact with each other even though the range of their favourable conditions do overlap. All scale-sizes should be considered in the future studies of auroral forms and electron acceleration regions, both in observational and theoretical approaches.