Mesospheric sprite current triangulation
Mesospheric sprite current triangulation
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中层精灵当前三角测量
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
D. Sentman
中科院分区：
文献类型：
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作者：
M. Füllekrug;D. Moudry;G. Dawes;D. Sentman
一个由三个时间同步的高精度感应线圈磁力计组成的网络在1998年7月在北美安装，用于测量频率范围为0.1 - 1000hz的精灵相关闪电波形。利用飞机上的同时强化视频观测，对16个相对于国家雷电探测网报告的母闪电放电有长延迟>33.33 ms的精灵进行了调查。可以区分出三种不同的长延迟精灵相关波形：38%没有表现出任何显著的磁场强度变化，25%表现出缓慢的变化~ 100 ms， 25%表现出短脉冲~ 4 ms。利用到达时差分析对精灵相关短脉冲的源位置进行了三角测量。一个源位置相对于母闪电放电显示出巨大的空间位移~ 60公里，这与从飞机上的视频观测的相应背景星场确定的精灵亮度边缘的方位角一致。从次短脉冲与精灵亮度的时空重合可以看出，这个精灵与中间层中的电流有关。
A network of three time-synchronized high-precision induction coil magnetometers is installed in North America to measure sprite-associated lightning flash waveforms in the frequency range 0.1–1000 Hz during the Energetics of Upper Atmosphere Excitation by Lightning, 1998, sprite campaign in July 1998. Simultaneous intensified video observations on board an aircraft are used to investigate 16 sprites with long time delays >33.33 ms relative to the parent lightning discharge reported by the National Lightning Detection Network. Three different long-delayed sprite-associated waveforms can be distinguished: 38% do not exhibit any significant magnetic intensity variation, 25% exhibit slow variations ∼100 ms, and 25% exhibit short pulses ∼4 ms. The source locations of the sprite-associated short pulses are triangulated by use of arrival time difference analysis. One source location exhibits a substantial spatial displacement ∼60 km relative to the parent lightning discharge, in agreement with the azimuths of sprite luminosity edges determined from the corresponding background star field of the video observations on board the aircraft. It is concluded from the temporal and spatial coincidence of the secondary short pulse and the sprite luminosity that this particular sprite is associated with current in the mesosphere.