High‐latitude ionospheric transient events in a global context
High‐latitude ionospheric transient events in a global context
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全球背景下的高纬度电离层瞬变事件
DOI：
10.1029/97ja00939
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发表时间：
1997
影响因子：
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通讯作者：
E. Friis
中科院分区：
文献类型：
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作者：
G. Korotova;D. Sibeck;T. Rosenberg;C. Russell;E. Friis
本文对 1986 年 2 月 14 日在高纬度全球地面磁力图中观测到的一系列瞬态事件进行了弓形激波运动、磁鞘动压力变化、日侧磁层磁场扰动和宇宙噪声吸收事件的全面研究。ISEE 2 航天器观测表明，大多数瞬态地面磁力计事件与黎明弓形激波在强向北和正交螺旋行星际的长时间内的突然向内和向外运动有关。磁场方向。地球同步 GOES 5 和 6 磁力计观测结果为相应的压缩和膨胀提供了证据，这些压缩和膨胀通过午前磁层向黄昏传播。在一些压缩过程中，磁层顶向内移动经过 CCE 航天器。压缩使磁层粒子散射，从而在高纬度地面测量仪记录的宇宙噪声吸收中产生准周期振荡。我们推断，太阳风动态压力（未观察到的）强烈的瞬态变化产生了各种现象，并且地面磁力计特征可以用 Southwood 和 Kivelson [1990] 的压力脉冲模型来最好地解释，其中太阳风动态压力的单个急剧变化会产生一对场对齐的电流。
This paper presents a comprehensive global study of bow shock motion, magnetosheath dynamic pressure variations, dayside magnetospheric magnetic field perturbations, and cosmic noise absorption events attending a sequence of transient events observed in high-latitude global ground magnetograms on February 14, 1986. ISEE 2 spacecraft observations indicated that most of the transient ground magnetometer events were associated with abrupt inward and outward motions of the dawn bow shock during a prolonged period of strongly northward and orthospiral interplanetary magnetic field orientation. Geosynchronous GOES 5 and 6 magnetometer observations provide evidence for corresponding compressions and expansions, which propagated duskward through the prenoon magnetosphere. The magnetopause moved inward past the CCE spacecraft during some of the compressions. The compressions scattered magnetospheric particles and thereby produced quasi-periodic oscillations in the cosmic noise absorption recorded by high-latitude ground riometers. We infer that (unobserved) strong transient variations in the solar wind dynamic pressure produced the various phenomena and that the ground magnetometer signatures are best explained in terms of the pressure pulse model of Southwood and Kivelson [1990], in which a single sharp change in the solar wind dynamic pressure generates a pair of field-aligned currents.
ISEE磁力计网络
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