Abstract
The ultra low frequency (ULF) wave in magnetosphere can act as an important means for solar wind energy inward transmission. This paper quantitatively analyzes the propagation process of the ULF wave triggered by the interplanetary shock propagating from inner magnetosphere equatorial plane along magnetic field lines to the top of the ionosphere and below ionosphere propagating process and establishes a relatively complete magnetosphere-ionosphere-atmosphere propagation model which can be used to study the relationship between the amplitude of the ULF waves triggered by the interplanetary shock wave in magnetospheric space and the magnetic effect caused by the ULF waves. After a comparison with recent observations, we found that: in the event during November 7, 2004 that an interplanetary shock wave interacted with the magnetosphere, Cluster satellites observed that electric field fluctuations and the band-pass filtered result of ground stations meridional component had similar characteristics. Comparing with the geomagnetic measurement near the footprints, we found that the electric field disturbance in the magnetosphere spread along the ground magnetic field lines in the form of the ULF waves and changed into geomagnetic disturbance. The result reveals that the ULF wave is in contact with the ground geomagnetic observation. The ULF waves couple with ionized components in ionosphere and spread to the ground in the form of electromagnetic waves. In this research, we believe that the magnetosphere, ionosphere and ground magnetic effects caused by interplanetary shock wave are the same physical phenomena responding in different locations. Based on the overall consideration of entire electromagnetic response to the interplanetary shock wave, we found that the correlation between CLUSTER multi-satellite observation and geomagnetic station observation is due to the ULF wave propagated in magnetosphere-ionosphere-atmosphere system, and we quantitatively interpreted this response process.
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Wang, C., Zong, Q. & Wang, Y. Propagation of interplanetary shock excited ultra low frequency (ULF) waves in magnetosphere-ionosphere-atmosphere—Multi-spacecraft “Cluster” and ground-based magnetometer observations. Sci. China Technol. Sci. 53, 2528–2534 (2010). https://doi.org/10.1007/s11431-010-4064-7
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DOI: https://doi.org/10.1007/s11431-010-4064-7