帮助 关于我们

返回检索结果

基于三亚VHF雷达的场向不规则体观测研究: 1.电离层E区连续性回波
Observations on the field-aligned irregularities using Sanya VHF radar: 1. Ionospheric E-region continuous echoes

查看参考文献26篇

文摘 基于三亚(109.6°E,18.4°N)VHF电离层相干散射雷达观测,分析了我国低纬电离层E区场向不规则结构连续性回波的发生特征。研究结果表明:白天,E区连续性回波的多普勒速度范围为-50至25 m/s,多普勒宽度主要分布在20至70 m/s;连续性回波的高度大约以1 km/h的速度缓慢下降,与偶发E层(Es)底部所在高度(h_bEs)有很好的相关性,表明在背景电场影响下,Es经梯度漂移不稳定性产生场向不规则结构,引起E区连续性回波。夜间,E区连续性回波的多普勒速度范围为-50至50 m/s,多普勒宽度为20至110 m/s,回波在时间-高度-强度图上常呈现多层结构,可能与潮汐引起的多个离子层相关;而E区连续性回波的短暂中断,以及120 km以上高E区连续性回波的发生,则可能归因于赤道扩展F极化电场的影响。此外,对E区连续性回波多普勒速度与全天空流星雷达风场观测的比较发现,在100 km以下,多普勒速度与子午风场有很好的相关性。
其他语种文摘 The occurrence characteristics of continuous radar echoes from low-latitude ionospheric E-region field-aligned irregularities are investigated, using the data from Sanya (109.6°E, 18.4°N) VHF coherent radar. The observational results show that the Doppler velocity and spectral width of daytime continuous echoes range from -50 to 25 m/s, and from 20 to 70 m/s, respectively. The echoes descend slowly with a descent rate of 1 km/h, and are highly correlated with the descending of the bottom height of Es trace (h_bEs). This probably indicates that the background electric field provides a favorable condition for the gradient-drift instability below the density layer producing the continuous echoes. While at nighttime, the Doppler velocity and spectral width of continuous echoes range from -50 to 50 m/s, and from 20 to 110 m/s, respectively. The E-region multiple echo layers, echo layer disruption and upper E-region echo layer generation are often observed during the post-sunset hours, which could be associated with the tidal ion layers, and with the mapping of polarization electric fields generated within the equatorial plasma bubbles, respectively. Additionally, the meridional winds derived from continuous echoes (coherent radar) were generally consistent with those estimated from specular meteor trails (all-sky meteor radar) below 100 km.
来源 地球物理学报 ,2013,56(3):719-730 【核心库】
DOI 10.6038/cjg20130301
关键词 低纬电离层E区 ; 场向不规则结构 ; 连续性回波 ; VHF相干雷达
地址

中国科学院地质与地球物理研究所, 北京空间环境国家野外科学观测研究站, 北京, 100029

语种 中文
文献类型 研究性论文
ISSN 0001-5733
学科 地球物理学
基金 国家自然科学基金 ;  中国科学院野外观测研究台站网络项目
文献收藏号 CSCD:4793608

参考文献 共 26 共2页

1.  Sudan R N. Generation of small-scale irregularities in the equatorial electrojet. J. Geophys. Res,1973,78(1):240-248 被引 2    
2.  Yamamoto M. Mid-latitude E-region field-aligned irregularities observed with the MU radar. J. Geophys. Res,1991,96(A9):15943-15949 被引 8    
3.  Haldoupis C. Characteristics of mid-latitude coherent backscatter from the ionospheric E region obtained with Sporadic E Scatter experiment. J. Geophys. Res,1996,101(A6):13387-13397 被引 7    
4.  Pan C J. A three-dimensional study of E-region irregularity patches in the equatorial anomaly region using the Chung-Li VHF radar. Geophys. Res. Lett,1994,21(17):1763-1766 被引 3    
5.  Krishnamurthy B V. Small-Scale (-3 m) E-region irregularities at and off the magnetic equator. J. Geophys. Res,1998,103(A9):20761-20773 被引 3    
6.  Chau J L. Statistical characteristics of low-latitude ionospheric field-aligned irregularities obtained with Piura VHF radar. Ann. Geophys,2002,20(8):1203-1212 被引 4    
7.  Patra A K. Statistical characteristics of VHF radar observations of low latitude E-region field-aligned irregularities over Gadanki. J. Atmos. Solar-Terr. Phys,2004,66(17):1615-1626 被引 5    
8.  李婧华. 2006年4月5日中等强度磁暴期间观测到的大经度范围等离子体泡. 空间科学学报,2008,28(2):123-131 被引 1    
9.  陈艳红. 海南地区电离层不规则体纬向漂移速度的观测和研究. 空间科学学报,2008,28(4):295-300 被引 7    
10.  张艳磊. 利用三站卫星闪烁数据测量电离层不均匀结构漂移速度. 地球物理学报,2010,53(7):1515-1519 被引 4    
11.  Ning B Q. The first time observations of low-latitude ionospheric irregularities by VHF radar in Hainan. Sci. China Tech. Sci,2012,55(5):1189-1197 被引 8    
12.  Li Z J. Planetary-scale wave observations over a low-latitude E region using simultaneous observations of VHF radar and ionosonde over Sanya (18.34°N, 109.62°E). J. Geophys. Res,2010,115(A12) 被引 1    
13.  Li G Z. Investigation of low-latitude E and valley region irregularities: Their relationship to equatorial plasma bubble bifurcation. J. Geophys. Res,2011,116:A11319 被引 5    
14.  Li G Z. A comparison of lower thermospheric winds derived from range spread and specular meteor trail echoes. J. Geophys. Res,2012,117:A03310 被引 3    
15.  Kagan L M. A wind-driven gradient drift mechanism for mid-latitude E-region ionospheric irregularities. Geophys. Res. Lett,1998,25(22):4141-4144 被引 6    
16.  Lee C C. The height of sporadic-E layer simultaneously observed by the VHF radar and ionosondes in Chung-Li. Geophys. Res. Lett,2000,27(5):641-644 被引 2    
17.  Balsley B B. Some characteristics of non-two-stream irregularities in the equatorial electrojet. J. Geophys. Res,1969,74(9):2333-2347 被引 1    
18.  Earle G D. Descending layer variability over Arecibo. J. Geophys. Res,2000,105(A11):24951-24961 被引 2    
19.  Szuszczewicz E P. Coupling mechanisms in the lower ionospheric-thermospheric system and manifestations in the formation and dynamics of intermediate and descending layers. J. Atmos. Terr. Phys,1995,57(12):1483-1496 被引 2    
20.  Mathews J D. Sporadic E: Current views and recent progress. J. Atmos. Sol. Terr. Phys,1998,60(4):413-435 被引 18    
引证文献 9

1 李国主 基于三亚VHF雷达的场向不规则体观测研究:2.东亚低纬电离层E区准周期回波 地球物理学报,2013,56(7):2141-2151
被引 8

2 李明 基于三亚VHF雷达的场向不规则体观测研究: 3.距离扩展流星尾迹回波 地球物理学报,2013,56(12):3969-3979
被引 0 次

显示所有9篇文献

论文科学数据集
PlumX Metrics
相关文献

 作者相关
 关键词相关
 参考文献相关

版权所有 ©2008 中国科学院文献情报中心 制作维护:中国科学院文献情报中心
地址:北京中关村北四环西路33号 邮政编码:100190 联系电话:(010)82627496 E-mail:cscd@mail.las.ac.cn 京ICP备05002861号-4 | 京公网安备11010802043238号