Radio Frequency Electromagnetic Radiation From Streamer Collisions
Radio Frequency Electromagnetic Radiation From Streamer Collisions
复制标题
流光碰撞产生的射频电磁辐射
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
A. Luque
中科院分区：
文献类型：
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作者：
A. Luque
我们提出了一个完整的流光传输电磁模型，其中麦克斯韦方程自洽地与电子输运和包括光致电离在内的反应一起求解。我们将这个模型应用于几十厘米宽、大电势差几百千伏的缝隙中反向传播流光的碰撞。我们的结果表明，流光碰撞发出的电磁脉冲，在大气压下，在大约100 MHz到几千兆赫的范围内，主导着扩展日冕的射频频谱。我们还研究了碰撞后电磁场对流光头的快速穿透，表明这些场能够将电子加速到约100keV。通过证实X射线和高频射电辐射之间的联系，并通过描述逃逸电子早期加速的机制，我们的结果支持了流光碰撞是电放电中高能过程的必要前兆的假设。
We present a full electromagnetic model of streamer propagation where the Maxwell equations are solved self‐consistently together with electron transport and reactions including photoionization. We apply this model to the collision of counter‐propagating streamers in gaps tens of centimeters wide and with large potential differences of hundreds of kilovolts. Our results show that streamer collisions emit electromagnetic pulses that, at atmospheric pressure, dominate the radio frequency spectrum of an extended corona in the range from about 100 MHz to a few gigahertz. We also investigate the fast penetration, after a collision, of electromagnetic fields into the streamer heads and show that these fields are capable of accelerating electrons up to about 100 keV. By substantiating the link between X‐rays and high‐frequency radio emissions and by describing a mechanism for the early acceleration of runaway electrons, our results support the hypothesis that streamer collisions are essential precursors of high‐energy processes in electric discharges.