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Characteristics of the Ionospheric Total Electron Content of the Equatorial Ionization Anomaly in the Asian-australian Region During 1996–2004 : Volume 27, Issue 10 (12/10/2009)

By Biqiang Zhao

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Book Id: WPLBN0003980866
Format Type: PDF Article :
File Size: Pages 13
Reproduction Date: 2015

Title: Characteristics of the Ionospheric Total Electron Content of the Equatorial Ionization Anomaly in the Asian-australian Region During 1996–2004 : Volume 27, Issue 10 (12/10/2009)  
Author: Biqiang Zhao
Volume: Vol. 27, Issue 10
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Liu, L., Ren, Z., Zhao, B., & Wan, W. (2009). Characteristics of the Ionospheric Total Electron Content of the Equatorial Ionization Anomaly in the Asian-australian Region During 1996–2004 : Volume 27, Issue 10 (12/10/2009). Retrieved from

Description: Beijing National Observatory of Space Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China. Ionospheric total electron content (TEC) of the equatorial ionization anomaly (EIA) is studied by analyzing dual-frequency signals of the Global Position System (GPS) acquired from a network of receivers around the Asian-Australian region during 1996–2004. The latitude, occurrence time, strength of the most developed EIA crest, and crest-to-trough ratio (CTR) for both the noon and post-sunset sector obtained from a daily TEC contour map have been used to study the solar cycle variations of EIA in the Asian-Australian region. The results reveal that semiannual and seasonal variations were the dominant factor that controls the morphology of the EIA structure which can be identified in the past studies (e.g. Wu et al., 2008). It is also found that the latitude and local time position of the anomaly crest show a hemispheric asymmetry because (a) The northern crest of EIA is expanded during the equinox indicating a weak semiannual variation while the southern crest is inhibited during June–August presenting a strong seasonal variation, and (b) The local time of the northern crest appears ~1.3 h earlier than that of the southern crest in June while showing no difference at December. Solar activity dependence is more evident in the EIA crest region than in the EIA trough region and least in the post-sunset sector at equinox. A seasonal linear relationship is derived between the post-sunset CTR and solar flux, which should be caused by the solar-dependant equatorial E×B vertical drift.

Characteristics of the ionospheric total electron content of the equatorial ionization anomaly in the Asian-Australian region during 1996–2004

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