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:2.东亚低纬电离层E区准周期回波
Observations on the field-aligned irregularities using Sanya VHF radar: 2.Low latitude Ionospheric E-region quasi-periodic echoes in the East Asian sector

查看参考文献23篇

文摘 中低纬电离层E区不规则体准周期雷达回波现象,在地球不同经度区被观测到并开展了有关研究.本文利用三亚(109.6°E,18.4°N)VHF相干散射雷达2011年2月6日的观测,第一次给出了中国低纬电离层E区准周期回波的发生和变化特征.观测结果表明:准周期回波发生在地方时夜间2100—2200LT的110km高度上,与连续性回波可同时发生;准周期回波斜纹在雷达探测的高度-时间-强度(HTI)图上可延伸5~20km,持续时间为5~15min,回波斜纹高度随时间以20~30m/s下降,斜纹在HTI图上彼此间隔10km和10min左右.此外,雷达回波多普勒谱和雷达干涉分析显示不同高度准周期回波的多普勒速度随高度-时间表现出不同的变化趋势,与回波条纹斜率无明显联系,不同高度准周期回波对应的不规则体在东西方向也表现出截然不同的运动特征.分析结果表明,三亚电离层E区准周期回波的发生可能并不是由散块Es随着中性风周期性的经过雷达探测区域所致,而可能和Es中的扰动结构相关.
其他语种文摘 The quasi-periodic(QP)radar echoes have been widely observed at middle latitudes. Analyzing the field-aligned coherent radar echoes observed on 6February 2011 over Sanya(109.6°E, 18.4°N), we present first results of quasi-periodic echoes in the Chinese low latitude region. The observational results show that QP echoes occurred above 110km around 2100—2200 LT, and coexisted with continuous radar echo layers. The altitude extent of the QP striations is in a range of about 5~20km and the duration is about 5~15 minutes. The QP echoes first appeared at higher altitude and then descended to the height close to the continuous echoing region, with a descent rate of 20~30m/s and a period of about 8minutes. Further, the Doppler velocities of QP echoes change in time and range and are not related to the striation slope. The zonal drift velocities derived from radar interferometric analysis of QP echoes show apparent variations with altitude. On the basis of earlier theories and simulations related to QP echoes, we suggest that the generation of QP echoes over Sanya may not be induced by the isolated Es patches which periodically move in the radar-viewing region, but could be associated with the disturbed structures generated within Es layer.
来源 地球物理学报 ,2013,56(7):2141-2151 【核心库】
DOI 10.6038/cjg20130701
关键词 低纬电离层E区 ; 准周期回波 ; 场向不规则体 ; 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:4900424

参考文献 共 23 共2页

1.  Yamamoto M. Midlatitude E region field-aligned irregularities observed with the MU radar. J.Geophys.Res,1991,96(A9):15943-15949 被引 8    
2.  Woodman R F. Gravity wave modulation of gradient drift instabilities in mid-latitude sporaidic E irregularities. Geophys.Res.Lett,1991,18(7):1197-1200 被引 4    
3.  Tsunoda R T. On the origin of quasi-periodic radar backscatter from midlatitude sporadic E. Radio Sci,1994,29(1):349-365 被引 4    
4.  Larsen M F. A shear instability seeding mechanism for quasiperiodic radar echoes. J.Geophys.Res,2000,105(A11):24931-24940 被引 6    
5.  Haldoupis C. Azimuth-Time-Intensity striations of quasiperiodic radar echoes from the mid-latitude E-region ionosphere. Geophys.Res.Lett,2001,28(10):1933-1936 被引 1    
6.  Hysell D L. HF radar observations of quasiperiodic E layer echoes over North America. J. Geophys.Res,1999,104(A3):4361-4371 被引 2    
7.  Tsunoda R T. First observations of quasi-periodic radar echoes from Stanford, California. Geophys.Res.Lett,1999,26(7):995-998 被引 2    
8.  Venkateswara Rao N. Low-altitude quasi-periodic echoes studied using a large database of Gadanki radar observations. J.Geophys.Res,2009,114(A1):A01313 被引 2    
9.  Pan C J. Quasi-periodic echoes observed with the Chung-Li VHF Radar during the SEEK Campaign. Geophys.Res.Lett,1998,25(11):1809-1812 被引 3    
10.  Tsunoda R T. First 24.5-MHz radar measurements of quasi-periodic backscatter from field-aligned irregularities in midlatitude sporadic. E. Geophys.Res.Lett,1998,25(11):1765-1768 被引 1    
11.  Ning B. The first time observations of low-latitude ionospheric irregularities by VHF radar in Hainan. Sci.China Tech.Sci,2012,55(5):1-9 被引 1    
12.  Li G Z. Precursor signatures and evolution of post-sunset equatorial spread-F observed over Sanya. J.Geophys.Res,2012,117(A8):A08321 被引 8    
13.  Li G Z. Investigation of lowlatitude E and valley region irregularities:Their relationship to equatorial plasma bubble bifurcation. J.Geophys.Res,2011,116:A11319 被引 5    
14.  Li G. A comparison of lower thermospheric winds derived from range spread and specular meteor trail echoes. J.Geophys.Res,2012,117(A3):A03310 被引 3    
15.  Farley D. Radar interferometry:A new technique for studying plasma turbulence in the ionosphere. J.Geophys.Res,1981,86(A3):1467-1472 被引 4    
16.  宁百齐. 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. 地球物理学报,2013,56(3):719-730 被引 9    
17.  Saito S. Observation of three-dimensional structures of quasi-periodic echoes associated with mid-latitude sporadic-E layers by MU radar ultra-multichannel system. Geophys.Res.Lett,2006,33(14):L14109 被引 1    
18.  Ogawa T. Characteristics and implications of Doppler spectra of E region quasi-periodic echoes observed by the multibeam middle and upper atmosphere radar. J.Geophys.Res,2006,111:A05309 被引 1    
19.  Maruyama T. Simultaneous observation of sporadic-E with a rapid-run ionosonde and VHF coherent backscatter radar. Ann.Geophys,2006,24(1):153-162 被引 2    
20.  Bernhardt P A. The modulation of sporadic-E layers by Kelvin-Helmholtz billows in the neutral atmosphere. J. Atmos.Sol.Terr.Phys,2002,64(12/14):1487-1504 被引 2    
引证文献 8

1 张雅彬 电离层沿场不规则体几何散射模型 电波科学学报,2015,30(2):269-273
被引 1

2 胡连欢 基于三亚VHF雷达的场向不规则体观测研究:4.太阳活动低年夏季F区回波 地球物理学报,2014,57(1):1-9
被引 4

显示所有8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