Precursors of Equatorial Spread F observing GPS TEC data from different GAGAN stations in India

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• 作者：A. Das ; ^{aditidas16@rediffmail.com} ; A. DasGupta ^{adg1bkpr@gmail.com}
• 关键词：Precursor to ESF ; LSWS in TEC ; Ionosphere
• 刊名：Advances in Space Research
• 出版年：2012
• 期刊代码：6_02731177
• 类别：et
• 出版时间：15 July, 2012
• 卷：50
• 期：2
• 页码：167-181
• 文件大小：3698 K

摘要

Occurrence of Spread F is more or less a daily phenomenon in the equatorial and low latitudinal stations during high to moderate sunspot number years. In this paper efforts have been made to identify possible precursors of Equatorial Spread F (ESF) using the Total Electron Content (TEC) data of seven GAGAN (GPS Aided Geo Augmented Navigation) stations in India during the two equinoxes of moderate sunspot number year 2004. Large Scale Periodic Structures found prior to TEC bite out can be taken as possible precursors to ESF. A threshold value of the peak to peak amplitude of this wave structure is chosen 2.6 TEC unit above which there is a possibility of ESF or TEC bite out with S4 > 0.26.