Features of stable diffuse arcs observed by means of auroral tomography
Features of stable diffuse arcs observed by means of auroral tomography
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极光层析成像观察稳定弥散弧的特征
DOI：
10.5194/angeo-25-1131-2007
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发表时间：
2007
影响因子：
1.9
通讯作者：
B. Z. Khudukon
中科院分区：
文献类型：
--
作者：
Zh. V. Dashkevich;V. E. Ivanov;B. Z. Khudukon
抽象的。本文研究了用极光层析成像方法恢复的弱漫射极光弧内光学体发射率的空间分布和光度强度的特点。断层图像是从1999年2月在俄罗斯科拉半岛上获得的扫描多通道光度计数据集，在三个网站的链延伸226公里沿着地磁子午线。分析了低地磁活动期间在一小时内观测到的15秒时间分辨率的427.8和557.7 nm发射。我们发现，沿地磁子午线沿着的单个弧的强度分布具有倒V形。在两个或两个以上的扩散弧期间，在南北方向上约140 km的距离处，可以观测到光度最大高度降低4-14 km。沉淀的电子通量的参数从积分方程，它决定了427.8 nm的强度高度分布和任意粒子能谱之间的最佳关系。积分方程以无量纲的能量耗散函数为核心。产生孤立扩散电弧的电子通量的估计平均能量在电弧的中心部分比其边界处的值高1-2 keV。
Abstract. In this paper we study the spatial distribution of optical volume emission rates and peculiarities of the luminosity intensity within weak diffuse auroral arcs recovered by means of auroral tomography. The tomographic images are obtained from sets of scanning multi-channel photometer data obtained in February 1999 on the Kola Peninsula in Russia at three sites of a chain extending 226 km along the geomagnetic meridian. The 427.8- and 557.7-nm emissions of a 15-s time resolution observed within one hour during low geomagnetic activity are analyzed. We found that the intensity profile of an individual arc along the geomagnetic meridian has an inverted-V-shape. The luminosity maximum altitude decrease by 4–14 km at about 140 km distance in the south-north direction can be observed during two or more diffuse arcs. The parameters of the precipitating electron flux are obtained from an integral equation, which determines the best relationship between the 427.8-nm intensity height profile and an arbitrary particle energy spectrum. A dimensionless function of the energy dissipation is used as the core in the integral equation. The estimated average energy of electron flux, which generated the isolated diffuse arc, is 1–2 keV higher in the central part of the arc in comparison to values at its borders.