globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024639
Scopus记录号: 2-s2.0-85043677168
论文题名:
Observation and Numerical Simulation of Cavity Mode Oscillations Excited by an Interplanetary Shock
作者: Takahashi K.; Lysak R.; Vellante M.; Kletzing C.A.; Hartinger M.D.; Smith C.W.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:3
起始页码: 1969
结束页码: 1988
语种: 英语
英文关键词: cavity mode oscillations ; interplanetary shock ; Van Allen Probes
英文摘要: Cavity mode oscillations (CMOs) are basic magnetohydrodynamic eigenmodes in the magnetosphere predicted by theory and are expected to occur following the arrival of an interplanetary shock. However, observational studies of shock-induced CMOs have been sparse. We present a case study of a dayside ultralow-frequency wave event that exhibited CMO properties. The event occurred immediately following the arrival of an interplanetary shock at 0829 UT on 15 August 2015. The shock was observed in the solar wind by the Time History of Events and Macroscale Interactions during Substorms-B and -C spacecraft, and magnetospheric ultralow-frequency waves were observed by multiple spacecraft including the Van Allen Probe-A and Van Allen Probe-B spacecraft, which were located in the dayside plasmasphere at L ∼1.4 and L ∼ 2.4, respectively. Both Van Allen Probes spacecraft detected compressional poloidal mode oscillations at ∼13 mHz (fundamental) and ∼26 mHz (second harmonic). At both frequencies, the azimuthal component of the electric field (Eϕ) lagged behind the compressional component of the magnetic field (Bμ) by ∼90°. The frequencies and the Eϕ-Bμ relative phase are in good agreement with the CMOs generated in a dipole magnetohydrodynamic simulation that incorporates a realistic plasma mass density distribution and ionospheric boundary condition. The oscillations were also detected on the ground by the European quasi-Meridional Magnetometer Array, which was located near the magnetic field footprints of the Van Allen Probes spacecraft. ©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/114298
Appears in Collections:气候减缓与适应

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作者单位: The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States; School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, United States; Department of Physical and Chemical Sciences, University of L'Aquila, L'Aquila, Italy; Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States; Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States; Department of Physics and Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH, United States

Recommended Citation:
Takahashi K.,Lysak R.,Vellante M.,et al. Observation and Numerical Simulation of Cavity Mode Oscillations Excited by an Interplanetary Shock[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(3)
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