DOI: 10.1029/2018JA025875
Scopus记录号: 2-s2.0-85052833353
论文题名: Ultrawideband Rising-Tone Chorus Waves Observed Inside the Oscillating Plasmapause
作者: Yu J. ; Li L.Y. ; Cui J. ; Wang J.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 8 起始页码: 6670
结束页码: 6678
语种: 英语
英文关键词: chorus waves
; growth rate
; oscillating plasmapause
; rising tone
英文摘要: Previous observations indicate that there are mainly unstructured plasmaspheric hiss in the high-density plasmasphere, whereas structured whistler mode chorus waves with the lowest frequency of 0.1fce (fce is the electron gyrofrequency) are observed mostly outside the plasmapause. Here we observed ultrawideband rising-tone chorus waves with frequencies extending to lower hybrid resonance frequency (fLHR ~ 101 Hz) in a dawnside high-density region (magnetic local time [MLT] ~ 7 hr and Ne ~ 75 cm−3) inside the oscillating plasmapause. The ultrawideband chorus waves have also typical two-band structures separated by a power gap at 0.5fce, but their lowest frequency (fLHR ~ 0.023fce) in the high-density region is much smaller than that of the normal chorus waves (>0.1fce) in the low-density trough (Ne < 40 cm−3). The Poynting fluxes of the waves indicate that the ultrawideband chorus waves are excited near the magnetic equator. By comparing the linear wave growth rate to the nonlinear growth rate, we found that the ultrawideband chorus waves are probably amplified through the nonlinear excitation mechanism. ©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/113437
Appears in Collections: 气候减缓与适应
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作者单位: Space Science Institute, Macau University of Science and Technology, Macau; School of Space and Environment, Beihang University, Beijing, China; School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, China; Key Laboratory of Lunar and Deep Space Exploration, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Yu J.,Li L.Y.,Cui J.,et al. Ultrawideband Rising-Tone Chorus Waves Observed Inside the Oscillating Plasmapause[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(8)