globalchange  > 气候减缓与适应
DOI: 10.1029/2017JA025087
Scopus记录号: 2-s2.0-85046282207
论文题名:
Van Allen Probes Observations of Drift-Bounce Resonance and Energy Transfer Between Energetic Ring Current Protons and Poloidal Pc4 Wave
作者: Oimatsu S.; Nosé M.; Takahashi K.; Yamamoto K.; Keika K.; Kletzing C.A.; Smith C.W.; MacDowall R.J.; Mitchell D.G.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:5
起始页码: 3421
结束页码: 3435
语种: 英语
英文摘要: A poloidal Pc4 wave and proton flux oscillations are observed in the inner magnetosphere on the dayside near the magnetic equator by the Van Allen Probes spacecraft on 2 March 2014. The flux oscillations are observed in the energy range of 67.0 to 268.8 keV with the same frequency of the poloidal Pc4 wave. We find pitch angle and energy dispersion in the phase difference between the poloidal magnetic field and the proton flux oscillations, which are features of drift-bounce resonance. We estimate the resonance energy to be ~120 keV for pitch angle (α) of 30° or 150° and 170–180 keV for α = 50° or 130°. To examine the direction of energy flow between protons and the wave, we calculate the sign of the gradient of proton phase space density (df/dW) on both the inbound and outbound legs of the orbit. We find the gradient to be outward on both legs, which means that energy is transferred from the protons to the wave. During the poloidal Pc4 wave event, the Dst* index shows a measurable increase of ~6.7 nT. We estimate the total energy loss of the ring current from the recovery of the Dst* index and from the variation of proton flux by the drift-bounce resonance. We suggest that energy transfer from the ring current protons to the poloidal Pc4 wave via the drift-bounce resonance contributes to up to ~85% of the increase of the Dst* index. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114031
Appears in Collections:气候减缓与适应

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作者单位: Graduate School of Science, Kyoto University, Kyoto, Japan; The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States; Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo, Japan; Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States; Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH, United States; Solar System Exploration Division, Goddard Space Flight Center, Greenbelt, MD, United States

Recommended Citation:
Oimatsu S.,Nosé M.,Takahashi K.,et al. Van Allen Probes Observations of Drift-Bounce Resonance and Energy Transfer Between Energetic Ring Current Protons and Poloidal Pc4 Wave[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)
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