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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Modulation of Magnetospheric Substorm Frequency: Dipole Tilt and IMF B_y Effects
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Modulation of Magnetospheric Substorm Frequency: Dipole Tilt and IMF B_y Effects

机译：磁层亚暴的调制频率:偶极子倾斜的话,国际货币基金组织(IMF)的影响

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摘要

Substorm activity is heavily influenced by the Interplanetary Magnetic Field (IMF) Bz component and magnetospheric substorms occur most frequently when Bz is strongly negative. The substorm occurrence rate is also affected by the magnitude of the B_y component, but it is usually presumed that this contribution is independent of the sign of B_y. Using five independent substorm onset lists, we show that substorm activity does depend on the sign of B_y near the solstices. Specifically, we show that substorms occur more frequently when B_y and the dipole tilt angle Ψ have different signs as opposed to when they have the same sign. These results confirm that the magnetosphere exhibits an explicit dependence on the polarity of B_y for nonzero Ψ, as other recent studies have suggested, and imply variation in the dayside reconnection rate and/or the magnetotail response. On the other hand, we find no clear relationship between substorm intensity and B_y regardless of Ψ. Last, for the onset list based on identifying negative bays at auroral latitudes, we observe an overall trend of more frequent onsets for positive B_y, regardless of season. However, substorm frequency in the other four substorm lists does not exhibit an overall preference for positive B_y. We show that this phenomenon is very likely a consequence of the particular substorm identification method (i.e., identification of negative bays), which is affected by local ionospheric conditions that depend on B_y and Ψ.
机译：亚暴活动严重影响行星际磁场(IMF) Bz组件和磁层亚暴的发生经常当Bz强烈负面。亚暴出现率也受到影响的话组件的大小,但它通常是假定这个贡献是独立的的话的标志。开始列表,我们表明,亚暴活动取决于的话在二至点附近的迹象。具体来说,我们表明,亚暴的发生经常当的话,偶极子Ψ倾斜角度有不同的迹象,而不是当他们吗相同的信号。磁气圈展示一个显式的依赖极性的非零Ψ的话,最近的研究表明,暗示变化的光面和/或重联率磁响应。找到亚暴之间没有明确的关系强度和的话不管Ψ。基于识别消极海湾开始列表极光纬度,我们观察一个总体的趋势无论如何,频繁发作对积极的话的季节。其他四个亚暴并不表现出一个列表总体倾向于积极的话。这种现象是很有可能的结果特定的亚暴识别方法(例如,识别消极的海湾),这是受到当地电离层条件的影响依靠的话,Ψ。

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