DOI: 10.1002/2015GL066893
论文题名: Variation in crossover frequency of EMIC waves in plasmasphere estimated from ion cyclotron whistler waves observed by Van Allen Probe A
作者: Matsuda S. ; Kasahara Y. ; Kletzing C.A.
刊名: Geophysical Research Letters
ISSN: 0094-9523
EISSN: 1944-9254
出版年: 2016
卷: 43, 期: 1 起始页码: 28
结束页码: 34
语种: 英语
英文关键词: EMIC wave
; heavy ion
; ion cyclotron whistler
; plasmasphere
; Van Allen Probe
Scopus关键词: Cyclotrons
; Earth atmosphere
; Heavy ions
; Magnetosphere
; Probes
; Cross-over frequencies
; Dispersion relations
; Electric and magnetic fields
; Ion composition
; Ion cyclotrons
; Mode conversions
; Plasmasphere
; Whistler waves
; Atmospherics
; altitude
; electromagnetic wave
; frequency analysis
; hydrogen
; ion microprobe
; magnetosphere
; wave generation
; wave propagation
; waveform analysis
; Pachycephalidae
英文摘要: We report variations in the propagation of the H+ band ion cyclotron whistlers observed by Van Allen Probe A. Ion cyclotron whistlers are one of the EMIC (electromagnetic ion cyclotron) waves generated by mode conversion from lightning whistlers. Crossover frequency is an important frequency for the ion cyclotron whistlers, which is a function of the variations in the local heavy-ion composition. We surveyed waveform data obtained by the Electric and Magnetic Field Instrument and Integrated Science instrument and found that 3461 H+ band ion cyclotron whistlers were observed from 572 km to 5992 km in altitude. The main finding is that the crossover frequencies of the observed events decreased with increasing altitude. These results support the hypothesis that the total heavy-ion density decreases with increasing altitude. Furthermore, in 96% of all observed events, the crossover frequencies exceeded 0.5fH+, which suggests that the EMIC dispersion relation contains a frequency gap of around 0.5fH+. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84957727611&doi=10.1002%2f2015GL066893&partnerID=40&md5=b268ffe629cb5380e870714af30932f8
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10486
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: Information Media Center, Kanazawa University, Kanazawa, Japan
Recommended Citation:
Matsuda S.,Kasahara Y.,Kletzing C.A.. Variation in crossover frequency of EMIC waves in plasmasphere estimated from ion cyclotron whistler waves observed by Van Allen Probe A[J]. Geophysical Research Letters,2016-01-01,43(1).