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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Storm time, short-lived bursts of relativistic electron precipitation detected by subionospheric radio wave propagation
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Storm time, short-lived bursts of relativistic electron precipitation detected by subionospheric radio wave propagation

机译：相对论的风暴,短暂的爆发电子降水subionospheric探测到无线电波传播

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摘要

In this study we report on ground-based observations of short bursts of relativistic electron precipitation (REP), detected by a subionospheric propagation sensor in Sodankyl?, Finland during 2005. In two ～4 hour case study periods from L = 5.2, around local midnight, several hundred short-lived radio wave perturbations were observed, covering a wide range of arrival azimuths. The vast majority (～99%) of these perturbations were not simultaneous with perturbations on other paths, consistent with a precipitation “rainstorm” producing ionospheric changes of small spatial sizes around the Sodankyl? receiver. The recovery time of these radio wave perturbations are ～1.2 s, which is consistent with the modeled effects of a burst of >2 MeV precipitating electrons. This agrees with satellite observations of the microburst energy spectrum. The energetic nature of the precipitation which produces the FAST perturbations suggests that they should be observable in both day and night conditions. While it is widely assumed that satellite-detected REP microbursts are due to wave-particle interactions with very low-frequency chorus waves, the energy spectra predicted by our current models of chorus propagation and wave-particle interaction are not consistent with the experimentally observed radio wave perturbations presented here or previously reported satellite observations of REP microbursts. The results inferred from both the satellite and subionospheric observations, namely the absence of a large, dominant component of <100 keV precipitating electrons, fundamentally disagrees with a mechanism of chorus-driven precipitation. Nonetheless, further work on the modeling of chorus-driven precipitation is required.
机译：在这项研究中我们报告在地面上相对论对短时间的观察电子降水(代表),检测到在Sodankyl subionospheric传播传感器吗?芬兰在2005年。从L = 5.2期间,在当地的午夜,几百个短暂的无线电波扰动观察,覆盖广泛到达方位角》。(~ 99%)的扰动同时与扰动对其他路径,符合降水“暴雨”生产电离层的变化小的空间尺寸在Sodankyl吗?这些无线电波干扰~ 1.2年代,建模效果是一致的一阵> 2兆电子伏沉淀电子。这与卫星观测的同意微爆发能量谱。快速沉淀的产生扰动表明他们应该可观察到的在两个日夜的条件。而人们普遍认为satellite-detected代表微爆发是由于波粒相互作用非常低频合唱波,能量谱我们当前的模型预测的合唱传播和波粒相互作用符合实验观测到的收音机这里给出波扰动或之前卫星观测的代表微爆发。卫星和subionospheric观察,即没有一个大的情况下,主要的组成部分< 100 keV沉淀电子,从根本上不同意chorus-driven的机制降水。建模chorus-driven降水必需的。

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