Steady magnetospheric convection events: How much does steadiness matter?
Steady magnetospheric convection events: How much does steadiness matter?
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稳定磁层对流事件：稳定性有多重要？
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. DeJong
中科院分区：
文献类型：
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作者：
A. DeJong
使用一种新的方法来识别稳定的磁层对流事件（SMCs），一个超过2000 SMCs的列表编制了11年之间的1997年和2007年。活跃的SMC在AL中有很大的波动，因此在小尺度活动方面的磁层不太稳定。经典SMC在AL稳定性方面落在中间50%，代表SMC的平均值。平静的SMC在AL中变化很小，是三个类别中最大的。在研究太阳风驱动器时，发现驱动器的稳定性不如驱动器的强度重要。除了Alfvenic马赫数和太阳风β之外，主动SMC具有更强的驱动器。还研究了这三类事件的SYM-H，以获得事件的近似风暴时间条件。当SYM-H小于−50 nT时，平静的SMC很少出现在风暴期间。如果在风暴期间发现SMC，那么它往往是一个更活跃的事件。
Using a new method to identify steady magnetospheric convection events (SMCs), a list of more than 2000 SMCs is compiled over the 11 years between 1997 and 2007. The SMCs are then categorized by the fluctuations in their AL. Active SMCs have large fluctuations in AL and therefore a less steady magnetosphere in terms of small‐scale activity. Classic SMCs fall in the middle 50% for AL steadiness and represent the average of the SMCs. Calm SMCs have very little changes in AL and are the steadiest of the three categories. When investigating the solar wind drivers, it is found that the steadiness of the drivers is less important than the strength of the driving. Active SMCs have stronger drivers with the exception of Alfvenic Mach number and solar wind beta. The SYM‐H of the three categories is also investigated for the approximate storm time conditions of the events. Calm SMCs rarely occur during storm time when SYM‐H is less than −50 nT. If an SMC is identified during storm time, then it tends to be a more active event.