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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Field line resonances as a trigger and a tracer for substorm onset
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Field line resonances as a trigger and a tracer for substorm onset

机译：场共振线触发和示踪剂为亚暴爆发

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摘要

In this paper, we show that periodic auroral arc structures are seen at the location of one particular auroral substorm onset for the 15 min preceding onset, suggesting that field line resonances should be considered a strong candidate for triggering substormonset. Irrespective of whether this field line resonance is coincidentally or causally linked to this substorm onset, the characteristics of the field line resonance can be used to remote sense the characteristics of the geomagnetic field line that supports substorm onset. In this instance, the eigenfrequency of this resonance is around 12 mHz. Interestingly, however, there is no evidence of this field line resonance in a seven satellite major Time History of Events and Macroscale Interactions during Substorms (THEMIS)-GOES conjunction, ranging from geosynchronous orbit to ~30 R_E. However, using space-based cross-phase measurements of the local field line eigenfrequency at the inner THEMIS locations, we find that the local field line eigenfrequency is 6–10 mHz. Hence, we can reliably say that this 12 mHz Field Line Resonance (FLR)must lie inside of THEMIS locations. Our conclusion is that a high-mfield line resonance can both represent a strong candidate for a trigger for substormonset, as first proposed by Samson et al. (1992), and that its characteristics can provide invaluable information as to where substorm onset occurs in the magnetosphere.
机译：在本文中,我们表明,周期性极光弧结构在一个的位置特定的极光亚暴15分钟开始发病前,这表明字段共振应该被认为是强大的触发substormonset候选人。而不管这个领域线共振是巧合还是因果关系亚暴,该领域的特点可以用于遥感线共振地磁场线的特性支持亚暴发病。的本征频率共振大约是12mHz。这个字段行共振的七个卫星重大历史事件和宏观尺度在亚暴(裁判)美丽的交互同时,从地球同步轨道~ 30 R_E。测量的局部场线忒弥斯本征频率的内部位置,我们发现当地的场线本征频率6 - 10 mHz。mHz场线共振(FLR)必须在撒谎忒弥斯的位置。high-mfield线共振既能代表引发substormonset强有力的候选人,作为第一参孙et al .(1992)提出的它可以提供宝贵的特征信息在哪里亚暴爆发发生在磁气圈。

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