Fractal analysis of radar images of Japanese winter thunderclouds inducing sprites and its comparison with their corresponding life cycle
Fractal analysis of radar images of Japanese winter thunderclouds inducing sprites and its comparison with their corresponding life cycle
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日本冬季雷云诱导精灵雷达图像的分形分析及其与相应生命周期的比较
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
D. Iudin
中科院分区：
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作者：
M. Hayakawa;Tomoyuki Suzuki;T. Nakamura;K. Michimoto;D. Iudin
在我们之前的论文（Hayakawa 等人，2005 2004）中，我们提出了在雷达回波图上使用分形维数，这使我们能够推断雷云的自组织，从而生成中层精灵。本文涉及 2001 年 12 月的某一天，当时我们在冬季的北陆地区（日本海一侧）观察到了很多精灵。我们表明，分形维数是估计自组织过程的一个非常有用的量，并结合物理和气象方面的一些考虑（不同高度的分形分析、雷达回波图像的横截面时间高度剖面）。与精灵生成相关的分形维数的时间演化可以通过雷暴的生命周期来令人满意地解释。
In our previous paper (Hayakawa et al., 2005 2004) we have proposed the use of fractal dimension for the radar echo maps, which enabled us to infer the self-organization of thunderclouds, leading to the generation of a mesospheric sprite. This paper deals with a particular day of December, 2001, when we observed a lot of sprites in the Hokuriku area (Japan Sea side) in the winter-time. We show that the fractal dimension is an extremely useful quantity to estimate the self-organization process, with some considerations combined with physical and meteorological aspects (fractal analyses at different altitudes, cross-sectional time-height profile of the radar echo images). The temporal evolution of fractal dimension in relation to the generation of sprites can be satisfactorily accounted for by the life-cycle of the thunderstorm.