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题名: On the envelope soliton below the H+ gyrofrequency in low auroral region
作者: Wang, DY; Huang, GL; Falthammar, CG
刊名: ASTROPHYSICS AND SPACE SCIENCE
出版日期: 2002
卷号: 282, 期号:2, 页码:421-432
文章类型: Article
英文摘要: Two envelope soliton events below the H+ gyrofrequency with localized density depletion were discovered in low auroral region (similar to 1760 km) by Freja satellite. These events were correlated in time with the observations of the ratio of oxygen ion density to hydrogen ion density sharp increase and the electrons energization. These envelope solitons have a characteristic frequency at similar to180-190 Hz, which are obviously different from the electron-ion lower hybrid wave frequency and the helium ion gyrofrequency in low auroral plasma, but it is close to the resonance frequency of hydrogen ion-oxygen ion hybrid wave. A modulational instability model of an ion-ion hybrid wave has been discussed here. It is found that the envelope soliton below the H+ gyrofrequency in low auroral region may be generated by this modulational instability on condition that the local oxygen ion density is larger than the local hydrogen ion density.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: LOWER-HYBRID WAVES ; FREJA OBSERVATIONS ; ION-ACCELERATION ; ELECTRON-PRECIPITATION ; ELF WAVES ; PLASMA ; IONOSPHERE
收录类别: SCI
语种: 英语
WOS记录号: WOS:000178929400006
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15806
Appears in Collections:太阳活动的多波段观测研究团组_期刊论文

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作者单位: 1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Royal Inst Technol, Alfven Lab, S-10044 Stockholm, Sweden
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