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Observations of 'Columniform' sprites

机译:观察“柱状”精灵

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This paper reports observations of a distinctive form of sprites associated with positive CG flashes carrying currents of 23 or less to about 100 kA in mesoscale thunderstorms. The sprites are characterized by long vertical columns about 10 km long, less than 1 km in diameter, and show virtually no variation in brightness along their length. Three dimensional triangulation of what we define as a 'columniform' sprite (c-sprite) event on the evening of 19 June 1995 showed that the individual elements had an average terminal altitude of 86.7 km and an average bottom of 76.2 km. Some show faint diffuse 'hair' or tendrils extending above and below the column. The sprite columns are nearly vertical, in video imagery. On some evenings, c-sprites are the dominant form of sprite activity above thunderstorms but, on other nights with many sprites, they may not be observed at all. Comparison of c-sprite forms vs National Lightning Detection Network (NLDN) positive cloud-to-ground current, shows a progression from simple thin vertical forms to brighter and more complicated forms. Theoretical explanations which predict the form and vertical structure of the classical sprites do not at present account for these different forms.
机译:本文报告了观察与阳性CG相关的独特形式的精灵闪烁,闪烁在Mescle雷暴中携带23或更低的电流。精灵的特征在于长垂直柱,长约10公里,直径小于1 km,并且沿其长度显示几乎没有亮度的变化。 1995年6月19日晚上,我们定义为“柱状”精灵(C-Sprite)活动的三维三角测量表明,各个元素的平均终端高度为86.7公里,平均底部为76.2公里。有些人在柱上和下方展示淡淡的漫射'头发'或卷须。 Sprite列几乎是垂直的,在视频图像中。在一些晚上,C-Sprites是雷暴以上的精灵活动的主要形式,但在许多精灵的其他夜晚,它们可能根本无法观察到。 C-Sprite Forms VS全国雷电检测网络(NLDN)正云到地电流的比较显示了简单薄垂直形式的进展,以更亮,更复杂的形式。预测典型精灵的形式和垂直结构的理论解释,目前尚未考虑这些不同的形式。

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