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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Characteristics of Substorm-Onset-Related and Nonsubstorm Earthward Fast Flows and Associated Magnetic Flux Transport: THEMIS Observations
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Characteristics of Substorm-Onset-Related and Nonsubstorm Earthward Fast Flows and Associated Magnetic Flux Transport: THEMIS Observations

机译：Substorm-Onset-Related特点和Nonsubstorm向地面的快速流动和关联忒弥斯磁通量传输:观察

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Substorms are closely associated with fast flows; however, many fast flows are not associated with substorm onsets and only lead to a localized, transient, and weak response in the magnetosphere and ionosphere. This study uses the midlatitude positive bay index to identify substorms. A case study investigates the magnetospheric and ionospheric responses to substorm-onset-related fast flows and nonsubstorm fast flows using observations from the THEMIS spacecraft and ionospheric currents. Statistics based on THEMIS observations made over 11 years show that substorm-onset-related fast flows are more likely to penetrate closer to the Earth and spread over a wider range of MLTs compared to nonsubstorm fast flows. The substorm-onset-related fast flow durations are slightly longer than nonsubstorm fast flow on average, and there is no significant difference between their peak velocity probability distributions. However, substorm-onset-related fast flows are statistically shown to be accompanied by substantially larger Bz increases that persist for longer periods of time, and hence result in 80% larger earthward-directed magnetic flux transport rates.
机译：亚暴与快速流动密切相关;然而,许多快速流动并不相关亚暴只发作导致本地化,瞬态和弱磁气圈的响应和电离层。积极湾指数,确定亚暴。研究调查了磁性层的电离层响应substorm-onset-related快速流和nonsubstorm快速流动使用忒弥斯航天器和观察电离层电流。观察在11年显示substorm-onset-related快速流动的可能性更大穿透接近地球和传播更广泛的mlt nonsubstorm相比快速的流动。持续时间比nonsubstorm略长快流平均,没有意义峰值速度之间的区别概率分布。substorm-onset-related快速流动伴随着统计显示大大大热,持续增加的时间更长,因此导致大80% earthward-directed磁通量运输率。

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