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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Azimuthal structures of substorm electron injection and their signatures in riometer observations
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Azimuthal structures of substorm electron injection and their signatures in riometer observations

机译：电子方位结构亚暴注入和宇宙噪声测量器的签名观察

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摘要

We propose a theoretical model to investigate the effects of the curvature/gradient (c/g) drift and the finite azimuthal extent of the dipolarization region on the electron injection process associated with the substorm dipolarization. We study the azimuthal structure of high-energy (>30 keV) electron precipitation flux and compare the result with riometer observations. We are able to reproduce three basic archetypes of riometer responses to substorms, namely, the spike, dispersionless injection, and dispersed injection events catalogued in previous observations. The electron injection near the duskward edge of the dipolarization region is most subject to azimuthal c/g drift loss, appearing in riometer observations as the “spike” feature. The “dispersionless injection” response is seen inside the dipolarization region but some distance away from its western border: or, alternatively, when the substorm has a rapid westward expansion, so that the gain and loss of electrons from the duskside and dawnside of a dipolarizing flux tube roughly balance. The “dispersed injection” feature is seen east of the dipolarization region. Our theory successfully explains the statistical differences in terms of magnetic local time location and peak intensity between spikes and injection events. Through the substorm event on 23 May 1998 we demonstrate that our theoretical predictions of riometer responses are very consistent with the observations. We highlight the potential of riometers in resolving the azimuthal extent and evolution of the dipolarization region, which provides a new ground-based technique of remote sensing the substorm process.
机译：我们提出一个理论模型来调查曲率的影响/梯度(c / g)漂移有限方位dipolarization的程度地区的电子注入过程与亚暴dipolarization。研究高能的方位结构(> 30凯文)电子沉降通量和比较结果与宇宙噪声测量器观察。重现宇宙噪声测量器的三个基本原型亚暴的反应,即尖峰,dispersionless注入,分散的注入在以前的观测记录事件。电子注入的duskward边缘附近dipolarization地区最受方位c / g漂移损失,出现在宇宙噪声测量器观察“飙升”功能。“dispersionless注入”的反应在dipolarization地区但一些距离其西部边境:或者,另外,当亚暴迅速西进运动,这样的得失从duskside和dawnside电子dipolarizing通量管大致平衡。“分散注射”功能是东方的dipolarization地区。解释了统计方面的差异磁当地时间位置和峰强度峰值和注入事件之间的关系。1998年5月23日我们证明亚暴事件我们的理论预测,宇宙噪声测量器的响应非常符合观测。强调宇宙噪声测量器解决的潜力的方位范围和演化dipolarization地区,它提供了一个新的地面遥感技术亚暴过程。

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