| DOI: | 10.1002/grl.50893
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| 论文题名: | Discovery of two distinct types of equatorial 150 km radar echoes |
| 作者: | Chau J.L.; Kudeki E.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8597
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| EISSN: | 1944-8328
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| 出版年: | 2013
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| 卷: | 40, 期:17 | | 起始页码: | 4509
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| 结束页码: | 4514
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| 语种: | 英语
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| 英文关键词: | 150-km echoes
; equatorial aeronomy
; ionospheric electric fields
; valley ionosphere
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| Scopus关键词: | 150-km echoes
; equatorial aeronomy
; Field-aligned irregularities
; Geomagnetic equator
; High sensitivity
; Ionospheric electric fields
; Signaltonoise ratio (SNR)
; Spectral widths
; Ionosphere
; Radar systems
; Incoherent scattering
; Doppler effect
; echo sounding
; electric field
; ionosphere
; signal-to-noise ratio
; valley
; Jicamarca
; Lima [Peru]
; Peru
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| 英文摘要: | We show here that VHF signals scattered from the 150 km region above Jicamaca exhibit two distinct types of features. In one type (type A), the Doppler spectral width increases with the echo strength and the corresponding signal-to-noise ratio (SNR). A second type (type B) of higher SNR echoes exhibits SNR-independent Doppler spectral widths that are much narrower than those observed in the first type. The type A echo population is by far the dominant population. Comparisons with earlier data sets collected at Jicamarca and elsewhere suggest that the type A and type B are likely to be associated with a naturally enhanced incoherent scattering (NEIS) process and the unstable growth of field-aligned irregularities (FAIs), respectively. We conjecture that small radar systems operated near the geomagnetic equator that have reported 150 km echo observations detected FAI echoes and that the NEIS echoes can only be seen by high sensitivity systems. Key Points Identification of two different echoes Enhancement of Incoherent scattering needs to be understood Less sensitive radars have observed only FAI echoes ©2013. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883594169&doi=10.1002%2fgrl.50893&partnerID=40&md5=ebd8e0114d7d71710f013ac9a23faa14
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/5861
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Leibniz Institute of Atmospheric Physics, Rostock University, Schloss-Str. 6, DE-18225 Kühlungsborn, Germany
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| Recommended Citation: | |
Chau J.L.,Kudeki E.. Discovery of two distinct types of equatorial 150 km radar echoes[J]. Geophysical Research Letters,2013-01-01,40(17).
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