Coherence of geomagnetic DP 2 fluctuations with interplanetary magnetic variations
Coherence of geomagnetic DP 2 fluctuations with interplanetary magnetic variations
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DOI：
10.1029/ja073i017p05549
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发表时间：
1968-09
影响因子：
--
通讯作者：
A. Nishida
中科院分区：
文献类型：
--
作者：
A. Nishida
将全球地磁资料与行星际IMP 1磁记录进行比较，发现DP2波动与行星际磁场南北分量变化一致，它被认为是磁层对流系统强度波动的地磁对应物。无论该分量是指向北方还是南方，都观察到这种一致性。行星间磁结构穿过弓形激波鼻端与地面上相关磁变化之间的平均时间延迟在极点为7分钟，在正午赤道为9分钟。提出的模型的磁层电场这种现象的适用性进行了严格审查，行星际电场到磁层的渗透建议的起源DP 2现象。
From the comparison of the worldwide geomagnetic data with IMP 1 magnetic records obtained in the interplanetary space, it is found that the DP 2 fluctuations, which are thought to be the geomagnetic counterpart of intensity fluctuations of the magnetospheric convective system, are coherent with variations in the north-south component of the interplanetary magnetic field. This coherence is observed irrespective of whether this component is directed northward or southward. Average time delay between the crossing of an interplantary magnetic structure across the nose of the bow shock and the associated magnetic variation on the ground is 7 minutes at the pole and 9 minutes at the midday equator. Applicability of the proposed models of the magnetospheric electric field to this phenomenon is critically examined, and the penetration of the interplanetary electric field into the magnetosphere is suggested as the origin of the DP 2 phenomenon.