Illumination of mesospheric irregularity by lightning discharge
Illumination of mesospheric irregularity by lightning discharge
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闪电放电对中层不规则性的照明
DOI：
10.1002/2013gl058502
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发表时间：
2013
影响因子：
5.2
通讯作者：
A. Evans
中科院分区：
文献类型：
--
作者：
M. Füllekrug;A. Mezentsev;S. Soula;O. V. D. Velde;A. Evans
理论模型计算最近预测了中间层不规则的存在，这有助于精灵的形成。本文报道了∼在∼80-85 公里高度的3-19 Km~3大的中层不规则性的实验探测，该不规则性是由强烈的正地闪电磁场照射的。闪电放电在闪电放电上方形成一个由4个闪电组成的瞬发群，在距闪电群至少15-20∼ km的水平距离处发现了中层不规则性，并在精灵群发生后40-60 ms重新变亮。这种再亮化是由局部准静态电场增强驱动的，电荷矩∼为4-20 Ckm，它导致不规则性从∼75-85公里高度向下发展成一个下降的发光柱。这种准静态电场增强是由于在∼为10-20个脉冲/ms的高空活动中，雷雨云内部的剩余电荷重新组织所致。这种中间层的不规则性可能会对用于原子时转移和海洋航行的100千赫无线电波的传播产生影响。
Theoretical model calculations recently predicted the existence of mesospheric irregularities which assist the initiation of sprites. Here we report the experimental detection of a ∼3–19 km3 large mesospheric irregularity at ∼80–85 km height which is illuminated by the electromagnetic field of an intense positive cloud‐to‐ground lightning discharge. While the lightning discharge causes a prompt group of four sprites above the lightning discharge, the mesospheric irregularity is found at a horizontal distance at least ∼15–20 km away from the sprite group and it rebrightens ∼40–60 ms after the sprite group occurrence. This rebrightening is driven by a local quasi‐static electric field enhancement with a charge moment ∼4–20 Ckm which causes the irregularity to develop a downward descending luminous column from ∼75–85 km height. The quasi‐static electric field enhancement is caused by the reorganization of residual charge inside the thundercloud during a high‐level activity of intracloud discharges with ∼10–20 pulses per ms. Such mesospheric irregularities might have an effect on the wave propagation of 100 kHz radio waves which are used for atomic time transfer and marine navigation.
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