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On the variability of the Equatorial Ionization Anomaly Trough over Indian region: A novel analysis using Beacon TEC measurements
Advances in Space Research ( IF 2.6 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.asr.2020.04.040
N. Mridula , Tarun Kumar Pant , G. Manju

Abstract A novel method using single station beacon Relative Slant Total Electron Content (RSTEC) measurements is proposed to estimate the location of Equatorial Ionization Anomaly Trough (EAT). The feasibility of this method is established based on simulations of RSTEC using (International Reference Ionosphere) IRI model electron densities. Using the RSTEC measured by the Coherent Radio Beacon Receiver at Thiruvananthapuram (8.5 O N geographic North, 77 O geographic E, 0.5 O N dip north), the spatial variability of the EAT location during 2006-2007 over the Indian region has been analyzed. The differential phase of signals emitted by beacons at 150 MHz and 400 MHz on board low earth orbiting satellites (LEOS) has been used to estimate the RSTEC. This study shows that EAT exhibits local time (morning – afternoon) variation as large as 7 degrees on either side of the dip equator. Further the trough location exhibits a systematic latitudinal change with seasons. The combined control of trans-hemispheric winds as well as magnetic field aligned diffusion is found to be the reason for the observed properties of trough location

中文翻译:

关于印度地区赤道电离异常槽的变异性:使用 Beacon TEC 测量的新分析

摘要 提出了一种利用单站信标相对倾斜总电子含量(RSTEC)测量估计赤道电离异常槽(EAT)位置的新方法。该方法的可行性是基于使用(国际参考电离层)IRI 模型电子密度对 RSTEC 的模拟而建立的。使用由 Thiruvananthapuram 的相干无线电信标接收器测量的 RSTEC(地理北纬 8.5,地理东纬 77 度,北倾角 0.5 度),分析了 2006-2007 年印度地区 EAT 位置的空间变异性。低地球轨道卫星 (LEOS) 上的信标以 150 MHz 和 400 MHz 发射的信号的差分相位已用于估计 RSTEC。这项研究表明,EAT 在倾角赤道两侧呈现出高达 7 度的当地时间(早上 - 下午)变化。此外,低谷位置随季节呈现系统的纬度变化。发现跨半球风和磁场定向扩散的联合控制是观测槽位置特性的原因
更新日期:2020-08-01
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