| DOI: | 10.1002/2015GL066255
|
| 论文题名: | Observations of discrete magnetosonic waves off the magnetic equator |
| 作者: | Zhima Z.; Chen L.; Fu H.; Cao J.; Horne R.B.; Reeves G.
|
| 刊名: | Geophysical Research Letters
|
| ISSN: | 0094-8387
|
| EISSN: | 1944-8118
|
| 出版年: | 2015
|
| 卷: | 42, 期:22 | | 起始页码: | 9694
|
| 结束页码: | 9701
|
| 语种: | 英语
|
| 英文关键词: | discrete structure
; magnetsonic wave
; off-equatorial region
|
| Scopus关键词: | Cyclotron resonance
; Geomagnetism
; Ray tracing
; Spectroscopic analysis
; Backward ray tracing
; Discrete structure
; Equatorial regions
; Harmonic structures
; Magnetosonic waves
; Multiple frequency
; Predominant frequency
; Spectral structure
; Cyclotrons
; electron
; equatorial dynamics
; frequency analysis
; geomagnetic field
; harmonic analysis
; observational method
; ray tracing
; spacing
; wave generation
; wave propagation
|
| 英文摘要: | Fast mode magnetosonic waves are typically confined close to the magnetic equator and exhibit harmonic structures at multiples of the local, equatorial proton cyclotron frequency. We report observations of magnetosonic waves well off the equator at geomagnetic latitudes from -16.5°to -17.9° and L shell ~2.7-4.6. The observed waves exhibit discrete spectral structures with multiple frequency spacings. The predominant frequency spacings are ~6 and 9 Hz, neither of which is equal to the local proton cyclotron frequency. Backward ray tracing simulations show that the feature of multiple frequency spacings is caused by propagation from two spatially narrow equatorial source regions located at L ≈ 4.2 and 3.7. The equatorial proton cyclotron frequencies at those two locations match the two observed frequency spacings. Our analysis provides the first observations of the harmonic nature of magnetosonic waves well away from the equatorial region and suggests that the propagation from multiple equatorial sources contributes to these off-equatorial magnetosonic emissions with varying frequency spacings. Key Points Magnetosonic waves at off-equatorial region exhibits harmonic structure The multiple frequency spacings are the same as the equatorial proton cyclotron frequency Magnetosonic emissions at off-equatorial region originate from multiple equatorial sources. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84956908894&doi=10.1002%2f2015GL066255&partnerID=40&md5=5271614ecf2b6aafd35753bf7482cd56
|
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8003
|
| Appears in Collections: | 科学计划与规划
气候变化与战略
|
|
There are no files associated with this item.
|
|
作者单位: | Institute of Earthquake Science, China Earthquake Administration, Beijing, China
|
| Recommended Citation: | |
Zhima Z.,Chen L.,Fu H.,et al. Observations of discrete magnetosonic waves off the magnetic equator[J]. Geophysical Research Letters,2015-01-01,42(22).
|
|
|