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The criterion for self-sustaining production of relativistic runaway electron avalanches by the positron feedback in thunderstorms
Atmospheric Research ( IF 5.5 ) Pub Date : 2022-07-02 , DOI: 10.1016/j.atmosres.2022.106329
E. Stadnichuk, E. Svechnikova

Relativistic runaway electron avalanches (RREA) occurring in thunderstorm large-scale electric fields are one of the sources of atmospheric gamma radiation. Relativistic feedback is the generation of RREAs by positrons or backscattered gamma rays of the previously produced RREAs. In strong electric fields, relativistic feedback can make RREAs self-sustainable that hypothetically can cause a terrestrial gamma-ray flash (TGF). This paper introduces a kinetic approach to study the positron relativistic feedback, which is predominant for the directly observed conditions within thunderstorms. The criterion for self-sustaining production of RREAs by the positron feedback in thunderstorms is derived. The discovered criterion allows one to obtain the parameters of the thunderstorm electric field required for self-sustaining RREA development with positron feedback for any altitude. It is shown that the derived conditions of self-sustainable RREA development are not achieved for the parameters of electric field observed in real thunderclouds.



中文翻译:

雷暴中正电子反馈自持产生相对论失控电子雪崩的判据

雷暴大尺度电场中发生的相对论失控电子雪崩(RREA)是大气伽马辐射的来源之一。相对论反馈是由先前产生的 RREA 的正电子或反向散射伽马射线产生 RREA。在强电场中,相对论反馈可以使 RREA 自我维持,假设可以导致地球伽马射线闪光 (TGF)。本文介绍了一种动力学方法来研究正电子相对论反馈,该方法主要用于雷暴中的直接观测条件。推导了雷暴中正电子反馈产生 RREA 的自持标准。所发现的标准允许人们获得雷暴电场的参数,该参数是自持 RREA 开发所需的,具有任何高度的正电子反馈。结果表明,对于在真实雷云中观测到的电场参数,并没有达到自持 RREA 发展的推导条件。

更新日期:2022-07-06
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