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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >The relativistic feedback discharge model of terrestrial gamma ray flashes
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The relativistic feedback discharge model of terrestrial gamma ray flashes

机译：相对论的放电模型的反馈地面伽马射线闪光

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As thunderclouds charge, the large-scale fields may approach the relativistic feedback threshold, above which the production of relativistic runaway electron avalanches becomes self-sustaining through the generation of backward propagating runaway positrons and backscattered X-rays. Positive intracloud (IC) lightning may force the large-scale electric fields inside thunderclouds above the relativistic feedback threshold, causing the number of runaway electrons, and the resulting X-ray and gamma ray emission, to grow exponentially, producing very large fluxes of energetic radiation. As the flux of runaway electrons increases, ionization eventually causes the electric field to discharge, bringing the field below the relativistic feedback threshold again and reducing the flux of runaway electrons. These processes are investigated with a new model that includes the production, propagation, diffusion, and avalanche multiplication of runaway electrons; the production and propagation of X-rays and gamma rays; and the production, propagation, and annihilation of runaway positrons. In this model, referred to as the relativistic feedback discharge model, the large-scale electric fields are calculated self-consistently from the charge motion of the drifting low-energy electrons and ions, produced from the ionization of air by the runaway electrons, including two- and three-body attachment and recombination. Simulation results show that when relativistic feedback is considered, bright gamma ray flashes are a natural consequence of upward +IC lightning propagating in large-scale thundercloud fields. Furthermore, these flashes have the same time structures, including both single and multiple pulses, intensities, angular distributions, current moments, and energy spectra as terrestrial gamma ray flashes, and produce large current moments that should be observable in radio waves.
机译：雷云电荷,大规模的字段可能接近相对论反馈阈值,上面相对论的生产失控的电子雪崩变得通过一代的自给自足向后传播正电子和失控反散射x射线。闪电可能会迫使大型电动字段在雷云之上相对论反馈阈值,引起的失控的电子,和由此产生的x射线和伽马射线发射,成长指数,产生非常大的通量高能辐射。增加,电子电离最终原因放电的电场,使相对论反馈阈值以下又减少了电子失控的通量。这些流程与新模式研究包括生产、传播、扩散,雪崩倍增失控的电子;x射线和伽马射线;传播和失控的毁灭正电子。相对论反馈放电模型大规模的电场进行了计算从电荷的运动自我一贯地漂流低能电子和离子空气电离的失控电子,包括两个和三体附件和重组。表明,当相对论反馈认为,明亮的伽马射线闪光向上的自然结果+ IC闪电在大规模的雷云领域的传播。此外,这些闪光结构,包括一个或多个脉冲、强度角分布,当前的时刻,和能量谱地面伽马射线闪光,并产生大目前的时刻,应该是可观测的无线电波。

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