ULF waves observed in solar wind and on the ground at high, mid, and low latitudes

ULF waves observed in solar wind and on the ground at high, mid, and low latitudes
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在太阳风和高、中、低纬度地面观测到的 ULF 波

DOI:
10.1016/j.jastp.2020.105220
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发表时间:
2020
影响因子:
1.9
通讯作者:
Streltsov, Anatoly V.
Streltsov, Anatoly V.
中科院分区:
地球科学4区
文献类型:
--
作者:
Alimaganbetov, Mergen;Streltsov, Anatoly V.

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我们分析了ACE卫星在L1拉格朗日点记录的太阳风磁场的波动,以及在84次强亚暴事件中用地面磁力计在高、中、低纬度观测到的ULF波。我们的目标是建立亚暴期间在太阳风-磁层-电离层系统的不同部分同时观测到的超低频振荡之间可能的联系。我们的分析表明,在太阳风和三个不同纬度的强亚暴期间观察到的频率小于1兆赫的振荡之间有很好的相关性。结果表明:(1)在高、中、低纬度地面观测到的波的主频基本相同;(2)在高、中、低纬度和太阳风中,频率为0.45-0.55mHz和0.75-0.80mHz的波最常见。因此,我们得出结论,在低于1 mHz的频率范围内,地球的磁层-电离层系统和太阳风之间存在强耦合,这是由磁场中的扰动介导的。
We analyze fluctuations of the magnetic field in the solar wind registered by the ACE satellite in the L1 Lagrangian point and the ULF waves observed with ground magnetometers at high, middle, and low latitudes during 84 intense substorm events. Our goal is to establish possible connections between ULF oscillations observed simultaneously in the different parts of the solar wind–magnetosphere–ionosphere system during substorms. Our analysis reveals that there is a good correlation between oscillations with frequencies less than 1 mHz observed in the solar wind and in three different latitudes during strong substorms. In particular, we show that: (1) the dominant frequencies of the waves observed on the ground at high, middle, and low latitudes are approximately the same; (2) the waves with frequencies of 0.45–0.55mHz, and 0.75–0.80mHz are the most often seen in high, middle, and low latitudes and in the solar wind. Therefore, we conclude that there is a strong coupling between the Earth’s magnetosphere–ionosphere system and the solar wind in the frequency range below 1mHz mediated by the disturbances in the magnetic field.
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