加速区有限横向尺寸对相对论性反馈的影响

IF 1.9 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Atmospheric and Solar-Terrestrial Physics Pub Date : 2025-02-27 DOI:10.1016/j.jastp.2025.106475

Alexander Sedelnikov , Egor Stadnichuk , Eduard Kim , Oraz Anuaruly , Daria Zemlianskaya

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引用次数: 0

摘要

地球伽玛射线闪光（TGFs）通常与相对论性失控电子雪崩（RREAs）有关。然而，研究表明，单个RREA不能产生可观察到的TGF通量。为了解决这个问题，约瑟夫·德怀尔提出了相对论反馈机制。由于RREAs起始点的横向扩散，加速区的横向尺寸有限会影响反馈。在该区域外由反馈产生的电子不能被电场加速而形成雪崩，这可能导致新雪崩总数的减少和反馈对自持RREA产生的要求的增加。本文用一个修正的二维扩散方程描述了雪崩起点的横向传播。对RREAs自持生产判据进行了修正。通过蒙特卡罗模拟计算了反馈系数的修正量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Influence of the finite transverse size of the accelerating region on the relativistic feedback

Terrestrial gamma-ray flashes (TGFs) are commonly associated with relativistic runaway electron avalanches (RREAs). However, research shows that a single RREA cannot generate observable TGF fluxes. In an attempt to settle this issue the relativistic feedback mechanism was suggested by Joseph Dwyer. Finite transverse size of the accelerating region can affect feedback due to lateral diffusion of RREAs starting points. Electrons created by the feedback outside this region cannot be accelerated by the electric field and form an avalanche, which may lead to a decrease in the total number of new avalanches and an increase in the requirements for self-sustaining RREA production by the feedback. In this article the transverse propagation of avalanches starting points was described using a modified two-dimensional diffusion equation. A correction to the criterion for self-sustaining production of RREAs was obtained. Monte Carlo simulation was also performed to calculate the correction for the feedback coefficient.

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来源期刊

Journal of Atmospheric and Solar-Terrestrial Physics 地学-地球化学与地球物理

CiteScore

4.10

自引率

5.30%

发文量

审稿时长

6 months

期刊介绍： The Journal of Atmospheric and Solar-Terrestrial Physics (JASTP) is an international journal concerned with the inter-disciplinary science of the Earth''s atmospheric and space environment, especially the highly varied and highly variable physical phenomena that occur in this natural laboratory and the processes that couple them. The journal covers the physical processes operating in the troposphere, stratosphere, mesosphere, thermosphere, ionosphere, magnetosphere, the Sun, interplanetary medium, and heliosphere. Phenomena occurring in other "spheres", solar influences on climate, and supporting laboratory measurements are also considered. The journal deals especially with the coupling between the different regions. Solar flares, coronal mass ejections, and other energetic events on the Sun create interesting and important perturbations in the near-Earth space environment. The physics of such "space weather" is central to the Journal of Atmospheric and Solar-Terrestrial Physics and the journal welcomes papers that lead in the direction of a predictive understanding of the coupled system. Regarding the upper atmosphere, the subjects of aeronomy, geomagnetism and geoelectricity, auroral phenomena, radio wave propagation, and plasma instabilities, are examples within the broad field of solar-terrestrial physics which emphasise the energy exchange between the solar wind, the magnetospheric and ionospheric plasmas, and the neutral gas. In the lower atmosphere, topics covered range from mesoscale to global scale dynamics, to atmospheric electricity, lightning and its effects, and to anthropogenic changes.