DOI: 10.1029/2018JA025338
Scopus记录号: 2-s2.0-85046358091
论文题名: Transmission of a Magnetospheric Pc1 Wave Beam Through the Ionosphere to the Ground
作者: Fedorov E.N. ; Pilipenko V.A. ; Engebretson M.J. ; Hartinger M.D.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 5 起始页码: 3965
结束页码: 3982
语种: 英语
英文关键词: EMIC waves
; ionospheric Alfvén resonator
; ionospheric waveguide
; pc1 pulsations
; ULF waves
英文摘要: A characteristic feature of the upper ionosphere is the occurrence of the ionospheric Alfvén resonator (IAR) and the ionospheric fast-mode waveguide (IFW), which can trap electromagnetic wave energy in the Pc1 frequency range from fractions of a hertz to a few hertz. This wave trapping ensures the dependence of ionospheric transmission/reflective properties on frequency. We numerically model magnetospheric Alfvén wave transmission through the ionosphere to the ground based on solution of the magnetohydrodynamic full-wave equations in a realistic ionosphere, whose parameters are reconstructed from the International Reference Ionosphere model. The spatial structure of an incident wave is modeled as a localized beam with a finite latitudinal scale λ⊥ and an azimuthally propagating wave. The IAR and IFW modes are coupled owing to the Hall conductivity and geomagnetic field inclination. Ground spatial and spectral structures of the Pc1 wave (0.1- to 6-Hz band) have been calculated for summer day/night conditions at the Antarctic Halley observatory, though results may be qualitatively applied to any midlatitude site. An incident wave with azimuthal wave vector ky=1.7·10−3 km−1, and λ⊥=102 km has been considered. The model predicts that beneath the incident beam the ground magnetic response “duplicates” its structure after accounting for a π/2 rotation and some latitudinal shift/widening. The transmission has an oscillatory dependence on frequency, thus forming “transmission windows” at resonant frequencies of IAR and IFW modes. The spectra vary depending on distance from an incidence point. Interference between IFW modes is revealed in the nonmonotonic and frequency-dependent character of latitudinal variations of wave amplitude. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114027
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Physics of the Earth, Moscow, Russian Federation; Space Research Institute, Moscow, Russian Federation; Center for Atmospheric and Space Sciences, Augsburg University, Minneapolis, MN, United States; Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
Recommended Citation:
Fedorov E.N.,Pilipenko V.A.,Engebretson M.J.,et al. Transmission of a Magnetospheric Pc1 Wave Beam Through the Ionosphere to the Ground[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)