Time-spatial correspondence between Pi2 wave power and ultra-violet aurora bursts
Time-spatial correspondence between Pi2 wave power and ultra-violet aurora bursts
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DOI：
10.2205/2017es000606
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发表时间：
2017-12
影响因子：
1.3
通讯作者：
V. Martines-Bedenko;V. Pilipenko;M. Engebretson;M. Moldwin
中科院分区：
文献类型：
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作者：
V. Martines-Bedenko;V. Pilipenko;M. Engebretson;M. Moldwin
我们已经研究了重叠的紫外线（UV）极光图像的快照从POLAR和IMAGE航天器和超低频波功率在Pi 2频段（5-30兆赫）。Pi 2光谱功率的纬度分布以及电离层电喷流的位置是从磁站MACCS-CARISMA-MEASURE阵列推断出来的。亚暴的发展是一系列的“爆炸”，伴随着极光亮度的增强，电离层电流的加强和Pi 2波功率的爆发。每次爆炸的震中都会向两极和向西移动。极光电离层向西电急流和Pi 2功率的纬向位置主要与极光激活区的向极边界有关。极光强度和Pi 2功率的纬向叠加分布统计结果支持了个例分析的结果。紫外极光椭圆和Pi 2能量“震中”之间的对应关系可能有助于确定Pi 2波能量从磁尾传输到地面的可能通道。
We have examined snapshots of overlaid ultra-violet (UV) auroral images from POLAR and IMAGE spacecraft and ULF wave power in the Pi2 frequency band (5–30 mHz). The latitudinal distribution of the Pi2 spectral power, as well as the position of the ionospheric electrojet, are inferred from the MACCS-CARISMA-MEASURE array of magnetic stations. A substorm develops as a series of “detonations”, accompanied by an enhancement of auroral luminosity, intensification of the ionospheric currents, and a burst of Pi2 wave power. The epicenter of each detonation leaps during each activation poleward and westward. The latitudinal location of the auroral ionospheric westward electrojet and Pi2 power is found to be mainly associated with the poleward border of the auroral activation region. The result of case studies is supported by statistical superposed latitudinal distributions of the auroral intensity and Pi2 power. The found correspondence between the UV auroral oval and Pi2 power “epicenter” may help to identify a possible channel of Pi2 wave energy transmission from the magnetotail to the ground.