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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Experimental evidence of D region heating by lightning-induced electromagnetic pulses on MF radio links
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Experimental evidence of D region heating by lightning-induced electromagnetic pulses on MF radio links

机译：D区域供暖的实验证据在MF前往电磁脉冲广播链接

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摘要

Broadband medium frequency (MF) measurements are used to study perturbations of the lower ionosphere related to lightning activity. A station measuring the vertical electric field in the MF band (500–1500 kHz) was set up in France in 2004. Just after the lightning return stroke, a strong attenuation is very frequently observed in the MF waves of radio transmissions. This perturbation effect is studied in each case of about 4000 return strokes and at nine radio frequencies. The main characteristics of the perturbation are a mean peak attenuation of 12 dB, an onset time of less than 1 ms, and a duration varying from 3 to 10 ms. Peak attenuations and durations are roughly proportional to the lightning-induced peak current. Perturbations are characterized by a circular structure with a radius reaching 250 km, which is centered on the return stroke location. The recovery time of the electromagnetic pulse (EMP) induced electron density is too long compared with the duration of the observed perturbation. However, we show that the origin of these MF wave perturbations, on timescales involved in the heating produced, can be explained by a lightning-induced electric field at 90 km altitude. The observed attenuation is compatible with a heating of 4–14 eV of the lower ionospheric electrons produced by the lightning electric field. These perturbations are then the MF radio signature of an EMP effect on the lower ionosphere, in the same way as elves correspond to their optical signature.
机译：宽带中频(MF)测量用于研究扰动的低电离层与闪电活动有关。站测量的垂直电场MF乐队(500 - 1500千赫)在法国成立在2004年。经常观察到强衰减波曼氏金融的无线电传输。研究了每种情况下的扰动影响大约4000九点返回中风和收音机频率。扰动是12的平均峰值衰减dB,起始时间小于1毫秒,和一个从3 - 10毫秒时间不同。衰减和持续时间是约前往峰成比例电流。圆形结构半径达到250公里,这是集中在回程位置。电磁脉冲的恢复时间(EMP)诱导电子密度太长了而观察到的持续时间微扰。这些MF波扰动,在时间尺度参与产生的加热,可以解释为前往电场在90公里的高度。学报》第4 - 14兼容的加热eV的低电离层电子产生的闪电电场。MF广播签名的EMP影响低电离层,以同样的方式作为精灵对应光签名。

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