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首页> 外文期刊>Journal of atmospheric and solar-terrestrial physics >Logarithmic decay and Doppler shift of plasma associated with sprites
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Logarithmic decay and Doppler shift of plasma associated with sprites

机译：与子图形关联的等离子体的对数衰减和多普勒频移

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VLF phase and amplitude perturbations in 'early/fast Trimpis' have been observed simultaneously on two or more transmitters at two or more receiver sites and simultaneously with sprites observed optically in Colorado. In all cases the early/fast Trimpis could apparently be resolved into two components: the RORD (rapid onset, rapid decay) component coincident with the sprite and a 'classic Trimpi' component having the slower onset and decay of Trimpis generally thought to be caused by whistler-induced electron precipitation from the radiation belts. The phase and amplitude perturbations can decay at very different rates, and even change in sign from positive to negative perturbation ('overshoot') during decay. This implies a spatial separation between the rapid decay plasma responsible for the RORD and the slow decay plasma responsible for the classic Trimpi component of up to a few tens of km. This is much less than the expected separation of sprite plasma and electron precipitation plasma induced by the same cloud-ground lightning. The discovery of very strong early/fast Trimpis in the tropics (Darwin, Australia), where electron precipitation is unlikely, which showed similar effects like overshoot but much more clearly, caused an examination of recent Colorado data of high resolution. The Colorado Trimpis, which are clearly associated with sprites, show the same features as the Darwin Trimpis where optically detected sprites were not available. Both can be explained in terms of sprite plasma decaying from the bottom up without recourse to electron precipitation.
机译：在两个或多个接收器位置的两个或多个发送器上同时观察到“早期/快速的Trimpis”中的VLF相位和幅度扰动，同时在科罗拉多州光学观察到了精灵。在所有情况下，早期/快速的Trimpis显然都可以分解为两个部分：与精灵重合的RORD（快速发作，快速衰变）组件和通常认为是由Trimpis引起的慢速发​​作和衰变的“经典Trimpi”组件由吹口哨引起的电子从辐射带中析出。相位和幅度扰动可以以非常不同的速率衰减，甚至在衰减过程中符号也从正扰动变为负扰动（“过冲”）。这意味着负责RORD的快速衰减等离子体与负责长达几十公里的经典Trimpi分量的缓慢衰减等离子体之间存在空间分隔。这远小于同一云层地面闪电引起的子画面等离子体和电子沉淀等离子体的预期分离。在热带地区（澳大利亚达尔文市）发现了非常强的早期/快速Trimpis，那里不太可能发生电子沉淀，这种现象表现出类似过冲的效应，但更为明显，这引起了对科罗拉多州近期高分辨率数据的研究。显然与子图形关联的科罗拉多Trimpis具有与达尔文Trimpis相同的功能，在达尔文Trimpis中没有可用光学检测的子图形。两者都可以用子午线等离子体从下而上衰减而不求助于电子沉淀来解释。

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