DOI: 10.1002/2014GL062359
论文题名: Preferential amplification of rising versus falling frequency whistler mode signals
作者: Li J.D. ; Harid V. ; Spasojevic M. ; Gołkowski M. ; Inan U.S.
刊名: Geophysical Research Letters
ISSN: 0094-9057
EISSN: 1944-8788
出版年: 2015
卷: 42, 期: 2 起始页码: 207
结束页码: 214
语种: 英语
英文关键词: ELF/VLF
; numerical simulation
; radiation belts
; Siple Station
; wave/particle interaction
Scopus关键词: Computer simulation
; Magnetosphere
; Numerical models
; Radiation belts
; Amplification ratio
; ELF/VLF
; Function of frequency
; Linear growth rate
; Nonlinear phase
; Siple Station
; Wave amplification
; Whistler-mode waves
; Atmospherics
; amplification
; atmospheric wave
; correlation
; frequency analysis
; nonlinearity
; optimization
; radio wave
; simulation
英文摘要: Analysis of ground-based ELF/VLF observations of injected whistler mode waves from the 1986 Siple Station experiment demonstrates the preferential magnetospheric amplification of rising over descending frequency-time ramps. From examining conjugate region receptions of ±1 kHz/s frequency-time ramps, we find that rising ramps generate an average total power 1.9 times higher than that of falling frequency ramps when both are observed during a transmission. And in 17% of receptions, only rising ramps are observed above the noise floor. Furthermore, the amplification ratio inversely correlates with the noise and total signal power. Using a narrowband Vlasov-Maxwell numerical simulation, we explore the preferential amplification due to differences in linear growth rate as a function of frequency, relative to the frequency which maximizes the linear growth rate for a given anisotropy, and in nonlinear phase trapping. These results contribute to the understanding of magnetospheric wave amplification and the preference for structured rising elements in chorus. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923619168&doi=10.1002%2f2014GL062359&partnerID=40&md5=9b2c4d46b71cd425e1e80b96ef3b298e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8673
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Electrical Engineering, Stanford University, Stanford, CA, United States
Recommended Citation:
Li J.D.,Harid V.,Spasojevic M.,et al. Preferential amplification of rising versus falling frequency whistler mode signals[J]. Geophysical Research Letters,2015-01-01,42(2).