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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Statistical properties and geoeffectiveness of southward interplanetary magnetic field with emphasis on weakly southward Bz events
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Statistical properties and geoeffectiveness of southward interplanetary magnetic field with emphasis on weakly southward Bz events

机译：统计特性和geoeffectiveness向南行星际磁场强调弱向南Bz事件

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摘要

In this work we analyze the statistical properties and geoeffectiveness of southward interplanetary magnetic field (IMF) B_z (B_s) events measured near the Earth from 1996 to 2015. We classify the Bs events into six contrasting classes according to the duration and intensity of B_s: two subclasses of long-lasting major intensity, two subclasses of long-lasting weak intensity, and two subclasses of short-lasting weak intensity. We find the following results. (1) The occurrence rate of B_s events is lowest for the long-lasting major-intensity B_s classes and increases toward shorter-lasting and weaker-intensity B_s classes. (2) Many of the B_s events in nearly all classes are associated with regions other than interplanetary coronal mass ejections and coronal hole high-speed streams. (3) Alfvén waves account for a significant fraction of the Bs events (e.g., ~60% for the short-lasting and weak-intensity B_s classes). (4) There are clear differences in solar cycle dependence of B_s events among the different B_s classes. (5) Even either the long-lasting or short-lasting weak-intensity class B_s events can often be geoeffective by triggering substorms of weak-to-medium intensity and by enhancing geosynchronous relativistic electron fluxes. In conclusion, we emphasize that even the weakly (in terms of either intensity or duration) southward IMF B_z should be considered significant from the viewpoint of their high occurrence rate and their geoeffectiveness compared to those of long-lasting major intensity.
机译：在这个工作我们分析统计特性向南和geoeffectiveness星际磁场(IMF)说是测量(B_s)事件从1996年到2015年接近地球。Bs事件分为六类对比显示的持续时间和强度B_s:两个长期大强度的子类,两个持久强度较弱的子类两个而且强度较弱的子类。我们发现以下结果。长期B_s事件率是最低的major-intensity B_s类和提高的方向shorter-lasting和weaker-intensity B_s类。(2)许多B_s事件几乎在所有类与地区其他比吗星际日冕物质抛射和日冕孔高速流。Bs事件的一个重要部分(例如,而且和~ 60%强度较弱B_s类)。B_s太阳活动周期的依赖关系的差异事件在不同B_s类。而且持续的时间持久或强度较弱类通常可以B_s事件geoeffective通过触发亚暴weak-to-medium强度和提高同步相对论电子通量。结论,我们甚至强调弱(向南的强度或持续时间)国际货币基金组织(IMF)说是应该被认为是重要的他们的出现率高和观点geoeffectiveness相比的长期大强度。

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