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DOI | 10.1029/2021GL095476 |
Short-periodic VLF emissions observed simultaneously by Van Allen Probes and on the ground | |
A. G. Demekhov; E. E. Titova; J. Manninen; A. S. Nikitenko; S. V Pilgaev | |
2021-10-10 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2021 |
英文摘要 | We present simultaneous observations of VLF emissions with periodic bursts by Van Allen Probe near geomagnetic equator and Kannuslehto and Lovozero ground-based sites. The repetition period and ground–spacecraft delay are consistent with guided whistler wave propagation between conjugate ionospheres. In contrast to lightning whistlers, the group velocity dispersion is not accumulated from one burst to another, thus implying a nonlinear mechanism of its compensation. Two regimes are observed. In one regime, Poynting flux direction alternates in the magnetosphere, and the burst period (2 s) is half of that detected on the ground (4 s), corresponding to single wave packet bouncing along the field line. This regime is switched to the other one, with burst period unchanged in the magnetosphere but halved on the ground. In this second regime, no alternating Poynting flux direction is observed. The second regime corresponds to two symmetrically propagating wave packets synchronously meeting at the equator. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/339806 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | A. G. Demekhov,E. E. Titova,J. Manninen,et al. Short-periodic VLF emissions observed simultaneously by Van Allen Probes and on the ground[J]. Geophysical Research Letters,2021. |
APA | A. G. Demekhov,E. E. Titova,J. Manninen,A. S. Nikitenko,&S. V Pilgaev.(2021).Short-periodic VLF emissions observed simultaneously by Van Allen Probes and on the ground.Geophysical Research Letters. |
MLA | A. G. Demekhov,et al."Short-periodic VLF emissions observed simultaneously by Van Allen Probes and on the ground".Geophysical Research Letters (2021). |
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