A survey of streamer and diffuse glow dynamics observed in sprites using telescopic imagery
A survey of streamer and diffuse glow dynamics observed in sprites using telescopic imagery
复制标题
使用望远镜图像对精灵中观察到的流光和漫射辉光动力学进行调查
DOI：
10.1029/2002ja009248
复制
发表时间：
2002
影响因子：
--
通讯作者：
U. Inan
中科院分区：
文献类型：
--
作者：
E. Gerken;U. Inan
[1]虽然精灵中的精细结构可以呈现出各种各样的形状，大小和时间尺度，但某些模式，如向上分支，向下分支，串珠，柱，双向流光和传播大规模扩散辉光区域被反复观察到。这些流光和漫辉光动态观察精灵的例子的情况下，提出使用视频数据获得的望远镜成像系统在1998年7月至8月，并进行比较，目前精灵和流光理论的预测。先前未报道的扩散辉光移动缓慢（约104 m/s），并且比在相同高度的流光形成预测的要宽。缓慢发展的负流光的突然变亮可能指示回击过程，其中流光与降低的电离层中的电荷连接。高层大气中的流星尘埃颗粒可能是许多负流光中存在的细珠的原因，并可能导致启动双头流光的等离子体增强。在柱子底部的珠子可以发光超过100毫秒，同时缓慢地向上漂移（约104米/秒）。柱可以从向下分支的正拖缆开始。在大的明亮子画面事件的底部和/或之前观察到微弱的正流光。一些精灵可以作为双头流光在增强的电子密度的局部区域中形成。流光形成区和扩散辉光区之间的过渡，观察到在1080公里的高度。在望远镜拍摄的漫射辉光区（也称为“精灵晕”）的图像中没有观察到精细结构[Barrington-Leigh and Inan，2001]。
[1] While the fine structure in sprites can assume a wide variety of shapes, sizes, and timescales, certain patterns such as upward branching, downward branching, beading, columns, bidirectional streamers, and propagating large-scale diffuse glow regions are repeatedly observed. Example cases of these streamer and diffuse glow dynamics observed in sprites are presented using video data obtained by a telescopic imaging system in July–August 1998 and are compared to predictions of current sprite and streamer theories. The previously unreported propagating diffuse glows move slowly (∼104 m/s) and are broader than that predicted for a streamer formation at the same altitude. Sudden brightening of slowly developing negative streamers may be indicative of a return stroke process in which the streamers connect with charge in a lowered ionosphere. Meteoric dust particles in the upper atmosphere may be responsible for the fine beading that exists in many negative streamers and may cause plasma enhancements that initiate double-headed streamers. Beads at the base of columns can glow for over 100 ms while slowly drifting upward (∼104 m/s). Columns may initiate from downward branching positive streamers. Faint positive streamers are observed at the base of and/or preceding large bright sprite events. Some sprites may initiate as double-headed streamers formed in localized regions of enhanced electron density. A transition between the streamer formation region and the diffuse glow region is observed at ∼80-km altitude. No fine structure is observed in telescopic images of the diffuse glow region also referred to as the “sprite halo” [Barrington-Leigh and Inan, 2001].
DOI：
10.1007/978-3-642-61247-3
发表时间：
1991-10
期刊：
--
影响因子：
--
作者：
Iu. P. Raizer
通讯作者：
Iu. P. Raizer