Turbulent microstructures and formation of folds in auroral breakup arc
Turbulent microstructures and formation of folds in auroral breakup arc
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DOI：
10.1029/2010ja016334
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发表时间：
2011-04-19
影响因子：
2.8
通讯作者：
Ebihara, Yusuke
中科院分区：
文献类型：
--
作者：
Kataoka, Ryuho;Miyoshi, Yoshizumi;Ebihara, Yusuke
我们进行了地面光学测量，指向当地的磁天顶与一个狭窄的视野9.3度的9.3度，使用高速电子倍增器电荷耦合器件相机在扑克平坦的研究范围。我们的证据表明，极光褶皱周期性地形成在一个分裂弧和光度指数增加约10秒前极光分裂发病。湍流微结构的演化和褶皱的形成可以用薄电流片中惯性阿尔芬波（IAW）湍流的非线性演化来解释。在这些光学观测的基础上，我们讨论了电离层调制的触发过程的发病通过自组织的IAW湍流与开尔文-亥姆霍兹和撕裂不稳定性的薄电流片的可能作用。
We conducted a ground-based optical measurement pointing at local magnetic zenith with a narrow field of view of 9.3 degrees by 9.3 degrees, using a high-speed electron multiplier charge-coupled device camera at Poker Flat Research Range. We show evidence that auroral folds were periodically formed in a breakup arc and the luminosity is exponentially increased for about 10 s before an auroral breakup onset. The evolution of turbulent microstructures and the formation of folds may be interpreted by the nonlinear evolution of inertial Alfven wave (IAW) turbulence in the thin current sheet. On the basis of these optical observations, we discuss a possible role of the ionosphere for modulating the triggering process of the onset via the self-organization of the IAW turbulence associated with Kelvin-Helmholtz and tearing instabilities of the thin current sheet.