Relativistic runaway breakdown in low-frequency radio

Relativistic runaway breakdown in low-frequency radio
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低频无线电中的相对论失控击穿

DOI:
10.1029/2009ja014468
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发表时间:
2010
期刊:
Space Physics
影响因子:
--
通讯作者:
Füllekrug M
Füllekrug M
中科院分区:
--
文献类型:
--
作者:
Füllekrug M

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本文研究了地球大气层内相对论逃逸击穿产生的电子雪崩束的电磁辐射。通过计算机模拟的理论建模发现,电子束发射电磁辐射,其特征在于在1000 kHz至300 kHz的低频无线电范围内,在1000 km的距离处的连续宽带脉冲。连续宽带脉冲存在的实验证据是由低频无线电观测到的精灵产生的闪电放电在1550公里的距离。所测量的宽带脉冲发生在产生子波的闪电放电之后的0.44 -9 ms,它们表现出主要跨越0.50至350 kHz的频率范围的电磁辐射,并且它们表现出复杂的波形,而没有第一跳天波的典型电离层反射。两个连续的脉冲分别出现在闪电放电后约4.5ms和约3 ms,与雪碧的亮度相吻合。结果表明,地球大气层中的相对论性失控击穿可以发射宽带电磁脉冲,并可能产生精灵。宽带脉冲的源位置可以通过宽带低频无线电接收机的干涉测量网络来确定,为相对论失控击穿理论提供进一步的实验支持。
The electromagnetic radiation emitted by an electron avalanche beam resulting from relativistic runaway breakdown within the Earth's atmosphere is investigated. It is found from theoretical modeling with a computer simulation that the electron beam emits electromagnetic radiation which is characterized by consecutive broadband pulses in the low‐frequency radio range from ∼10 to 300 kHz at a distance of ∼800 km. Experimental evidence for the existence of consecutive broadband pulses is provided by low‐frequency radio observations of sprite‐producing lightning discharges at a distance of ∼550 km. The measured broadband pulses occur ∼4–9 ms after the sprite‐producing lightning discharge, they exhibit electromagnetic radiation which mainly spans the frequency range from ∼50 to 350 kHz, and they exhibit complex waveforms without the typical ionospheric reflection of the first hop sky wave. Two consecutive pulses occur ∼4.5 ms and ∼3 ms after the causative lightning discharge and coincide with the sprite luminosity. It is concluded that relativistic runaway breakdown within the Earth's atmosphere can emit broadband electromagnetic pulses and possibly generates sprites. The source location of the broadband pulses can be determined with an interferometric network of wideband low‐frequency radio receivers to lend further experimental support to the relativistic runaway breakdown theory.
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