Global Pc5 pulsations during strong magnetic storms: excitation mechanisms and equatorward expansion
Global Pc5 pulsations during strong magnetic storms: excitation mechanisms and equatorward expansion
复制标题
强磁暴期间的全球 Pc5 脉动：激发机制和赤道扩张
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
E. Zesta
中科院分区：
文献类型：
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作者：
J. A. Marin;V. Pilipenko;O. Kozyreva;M. Stepanova;M. Engebretson;P. Vega;E. Zesta
抽象。利用跨美洲和跨斯堪的纳维亚磁强计网络在上午和中午后的地磁当地时间（MLT）部门的数据，考虑了2003年10月29日至31日磁暴期间全球Pc 5波的动力学。我们研究的纬度分布的Pc 5波的频谱特征，以确定如何深入到磁层这些Pc 5波可以延伸在不同的侧翼的磁层。10月29-30日和10月31日浪事件的波能传输机制是不同的。此外，我们研究是否自激开尔文-亥姆霍兹不稳定性是足够的全球Pc 5波的激发机制。我们认为，在10月31日磁层磁流体动力学（MHD）波导被激发，其激发的刚性制度是由太阳风密度的增强触发。强磁暴恢复阶段Pc 5波活动的上述特征，在用超低频（ULF）波模拟相对论电子散射过程中应予以考虑。
Abstract. The dynamics of global Pc5 waves during the magnetic storms on 29–31 October 2003 are considered using data from the trans-American and trans-Scandinavian networks of magnetometers in the morning and post-noon magnetic local time (MLT) sectors. We study the latitudinal distribution of Pc5 wave spectral characteristics to determine how deep into the magnetosphere these Pc5 waves can extend at different flanks of the magnetosphere. The wave energy transmission mechanisms are different during 29–30 October and 31 October wave events. Further, we examine whether the self-excited Kelvin–Helmholtz instability is sufficient as an excitation mechanism for the global Pc5 waves. We suggest that on 31 October a magnetospheric magnetohydrodynamic (MHD) waveguide was excited, and the rigid regime of its excitation was triggered by enhancements of the solar wind density. The described features of Pc5 wave activity during recovery phase of strong magnetic storm are to be taken into account during the modeling of the relativistic electron energization by ultra-low-frequency (ULF) waves.