Inverted‐V events simultaneously observed with the Freja satellite and from the ground
Inverted‐V events simultaneously observed with the Freja satellite and from the ground
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Freja 卫星和地面同时观测到的倒 V 事件
DOI：
10.1029/94gl01692
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发表时间：
1994
影响因子：
5.2
通讯作者：
H. Lühr
中科院分区：
文献类型：
--
作者：
G. Haerendel;H. Frey;O. Bauer;E. Rieger;J. Clemmons;M. Boehm;D. Wallis;H. Lühr
这篇论文报告了Freja卫星在两次通过Gillam/Manitoba上空的大极光弧系统或倒v事件时收到的数据，当时除了CANOPUS网络外，还在该地点操作了特殊的广角CCD相机。详细的比较了可见结构与调制的初级电子通量进行了。这种精细结构的运动被解释为屏蔽低层电离层的高空电场。同时读数的电流密度，加速电压和能量通量，后者由粒子和极光亮度测量确定，发现内部一致。如果考虑磁层中源电子的密度和能量的实质性变化，我们从这些数据中计算出电流遇到的有效电阻，并发现与镜像阻抗的动力学理论一致。
The paper reports data received from the Freja satellite during two passes over broad auroral arc systems or inverted-V events above Gillam/Manitoba when special wide-angle CCD cameras were operated at this location in addition to the CANOPUS network. Detailed comparisons of the visible structures with modulations of the primary electron fluxes are performed. Motions of this fine structures are interpreted in terms of high-altitude electric fields shielded from the lower ionosphere. Simultaneous readings of current density, accelerating voltage and energy flux, the latter determined both from particle and auroral brightness measurements, are found to be internally consistent. We calculate from these data the effective resistance encountered by the electric currents and find agreement with the kinetic theory of the mirror impedance, if we allow for substantial variations in density and energy of the source electrons in the magnetosphere.