Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《中国科学:技术科学(英文版)》 2012-05
Add to Favorite Get Latest Update

Ionospheric longitudinal variations at midlatitudes: Incoherent scatter radar observation at Millstone Hill

ZHANG ShunRong*, COSTER Anthea, HOLT John, FOSTER John & ERICKSON Phil MIT Haystack Observatory, Off Route 40, Westford, MA 01866, USA  
Incoherent scatter radar (ISR) extra-wide coverage experiments during the period of 1978–2011 at Millstone Hill are used to investigate longitudinal differences in electron density. This work is motivated by a recent finding of the US east-west coast difference in TEC suggesting a combined effect of changing geomagnetic declination and zonal winds. The current study provides strong supporting evidence of the longitudinal change and the plausible mechanism by examining the climatology of electron density Ne on both east and west sides of the radar with a longitude separation of up to 40o for different heights within 300–450 km. Main findings include: 1) The east-west difference can be up to 60% and varies over the course of the day, being positive (East side Ne West side Ne) in the late evening, and negative (West side Ne East side Ne) in the pre-noon. 2) The east-west difference exists throughout the year. The positive (relative) difference is most pronounced in winter; the negative (relative) difference is most pronounced in early spring and later summer. 3) The east-west difference tends to enhance toward decreasing solar activity, however, with some seasonal dependence; the enhancements in the positive and negative differences do not take place simultaneously. 4) Both times of largest positive and largest negative east-west differences in Ne are earlier in summer and later in winter. The two times differ by 12–13 h, which remains constant throughout the year. 5) Variations at different heights from 300–450 km are similar. Zonal wind climatology above Millstone Hill is found to be perfectly consistent with what is expected based on the electron density difference between the east and west sides of the site. The magnetic declination-zonal wind mechanism is true for other longitude sectors as well, and may be used to understand longitudinal variations elsewhere. It may also be used to derive thermospheric zonal winds.
【Fund】: supported by the National Natural Science Foundation of China (Grant No. 40890164);; the US National Science Foundation under Cooperative Agreements (Grant Nos. ATM-0733510 and ATM-6920184)
【CateGory Index】: P352.7
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
【References】
Chinese Journal Full-text Database 1 Hits
1 XU Ji-Sheng,LI Xue-Jing,LIU Yi-Wen,JING Min College of Electronic Informatics,Wuhan University,Wuhan 430072,China;Effects of declination and thermospheric wind on TEC longitude variations in the mid-latitude ionosphere[J];Chinese Journal of Geophysics;2013-05
【Citations】
Chinese Journal Full-text Database 1 Hits
1 Zhang Shun-rong;Huang Xin-yu(Wuhan institute of Pkyticr,the Chinese Academy of Sciences,430071);NEUTRAL WIND-INDUCED F REGION MOVEMENTS UNDER THE COUPLING OF IONOSPHERE-THERMOSPHERE[J];CHINESE JOURNAL OF SPACE SCIENCE;1995-02
【Co-citations】
Chinese Journal Full-text Database 1 Hits
1 XIAO ZUO (Department of Geophysics, Peking University, Beijing 100871, China);RESEARCHES ON IONOSPHERIC PHYSICS IN RECENT YEARS IN CHINA[J];Chinese Journal of Geophysics;1997-S1
China Proceedings of conference Full-text Database 1 Hits
1 XIAO ZUO (Department of Geophysics, Peking University, Beijing 100871, China);RESEARCHES ON IONOSPHERIC PHYSICS IN RECENT YEARS IN CHINA[A];[C];1997
【Co-references】
Chinese Journal Full-text Database 2 Hits
1 XU Ji-Sheng,ZHU Jie,CHENG Guang-HuiCollege of Electronic Informatics,Wuhan University,Wuhan 430079,China;GPS observations of ionospheric effects of the major storm of Nov.7-10,2004[J];Chinese Journal of Geophysics;2006-04
2 XU Liang, CHENG GuangHui, XU JiSheng & LIU YongMin School of Electronic Information, Wuhan University, Wuhan 430079, China;Global ionospheric TEC response to a strong magnetic storm[J];中国科学(E辑:技术科学)(英文版);2008-10
【Secondary Citations】
Chinese Journal Full-text Database 2 Hits
1 Zhang Shun-rong Su Yuan-zhi Huang Xin-yu(Wuhan Institute of Physics Academia Sinica, 430072);THE VERTICAL PLASMA DRIFTS NEAR THE IONOSPHERIC PEAK[J];Chinese Journal of Space Science;1992-04
2 Zhang Shun-rong; Huang Xin-yu (Wuhan Institute of Paysics, Academic Sinica, 430072);NUMERICAL SIMULATION OF IONOSPHERIC STRUCTURE BELOW F_2 PEAK[J];CHINESE JOURNAL OF SPACE SCIENCE;1994-02
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved