DOI: 10.1029/2018JA025289
Scopus记录号: 2-s2.0-85050264613
论文题名: Periodic Oscillations in the D Region Ionosphere After the 2011 Tohoku Earthquake Using LF Standard Radio Waves
作者: Ohya H. ; Tsuchiya F. ; Takishita Y. ; Shinagawa H. ; Nozaki K. ; Shiokawa K.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 6 起始页码: 5261
结束页码: 5270
语种: 英语
英文关键词: acoustic waves
; coseismic oscillations
; D region ionosphere
; LF radio waves
; Rayleigh waves
; Tohoku earthquake
英文摘要: We report the first observations of ~100-s periodic oscillations of intensity in low-frequency (LF) standard radio waves over Japan at 05:51–05:56 UT, which was about 4 min and 42 s after mainshock onset of “the 2011 off the Pacific coast of Tohoku earthquake” on 11 March 2011 (Mw 9.0). The LF radio wave propagation paths used in this study were JJY (Japan, 60 kHz)-Rikubetsu (RKB, Japan), and BPC (China, 68.5 kHz)-RKB, where the minimum distances between the epicenter and the LF propagation paths were 413.6 and 561.5 km, respectively. The observed modulations in intensity and phase were about 0.1 dB and 0.5°, respectively. Based on a numerical simulation of the neutral atmosphere and the wave-hop method, the occurrence time of the ~100-s periodic oscillations was in good agreement with the total propagation time of the Rayleigh wave that spread concentrically from the epicenter to the LF propagation paths and acoustic waves propagating vertically from the Earth's surface to the bottom of the ionosphere. Variations in synthesized electric field intensity of ground waves and sky waves, calculated by the wave hop method up to 10 hops, reproduced similar ~100-s periodic oscillations that were caused by the difference in arrival time of the acoustic waves excited by the Rayleigh waves at each hop point. The amplitude of the D region electron density variations at 70 km altitude during the ~100-s periodic oscillation was estimated to be about 1% compared to the background electron density, based on the numerical simulation. ©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/113778
Appears in Collections: 气候减缓与适应
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作者单位: Graduate School of Engineering, Chiba University, Chiba, Japan; Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University, Sendai, Japan; National Institute of Information and Communications Technology, Koganei, Japan; Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
Recommended Citation:
Ohya H.,Tsuchiya F.,Takishita Y.,et al. Periodic Oscillations in the D Region Ionosphere After the 2011 Tohoku Earthquake Using LF Standard Radio Waves[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(6)