On the application of differential phase measurements to study the zonal large scale wave structure (LSWS) in the ionospheric electron content
On the application of differential phase measurements to study the zonal large scale wave structure (LSWS) in the ionospheric electron content
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DOI：
10.1029/2011rs004870
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发表时间：
2012-04
期刊：
影响因子：
1.6
通讯作者：
S. T. Ram;Masahiro Yamamoto;R. Tsunoda;S. Thampi;S. Gurubaran
中科院分区：
文献类型：
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作者：
S. T. Ram;Masahiro Yamamoto;R. Tsunoda;S. Thampi;S. Gurubaran
最近建立了GNU无线电信标接收器网络，以覆盖东南亚和太平洋低纬地区，并计划扩展到印度和非洲经度地区。随着通信/导航中断预报系统(C/NOFS)卫星在低倾角(13°)轨道上发射CERTO(相干电磁层析成像)信标，研究电离层总电子含量(TEC)的纬向大尺度波结构(LSWS)成为可能。通过一个简单的初始偏移距估计的单站程序，实现了从低倾角CNOFS轨道的相对TEC测量中确定绝对TEC的自动化程序，这与建立得较好的两站方法和数字探空仪的观测结果是一致的。通过从TEC的纵向变化中减去背景变化来提取LSWS。LSWS的上升表现为残馀TEC变化的耗尽。此外，这些带状结构通常与地磁线对齐，闪烁斑块与TEC耗竭的西壁对齐。这种空间排列概括了TEC中观测到的纬向波状结构是底侧LSWS的表现这一前提。因此，本文提出的方法在未来将被证明是有用的，以定期研究LSWS的特征。
The GNU Radio Beacon Receiver (GRBR) Network has been recently established to provide coverage of Southeast Asia and Pacific low‐latitude regions, with planned extensions into the Indian and African longitude sectors. With the availability of CERTO (Coherent Electromagnetic Radio Tomography) beacon transmissions from Communication/Navigation Outage Forecasting System (C/NOFS) satellite, which is in a unique low‐inclination (13°) orbit, it is now possible to study zonal large scale wave structure (LSWS) in ionospheric total electron content (TEC) with fine spatial resolution over a wide longitudinal region. An automated procedure to determine absolute TEC from relative TEC measurements for low inclination CNOFS orbits has been implemented through a simple single station procedure for initial offset estimation, which is shown to be consistent with the better established two station method and with observations from a Digisonde. The LSWS is extracted by subtracting the background variation from longitudinal variation of TEC. The upwellings of LSWS manifest as depletions in the residual TEC variations. Further, these zonal structures have been found, in general, to be aligned with geomagnetic field lines, and the scintillation patches have been found to align with the west walls of TEC depletions. This spatial alignment recapitulates the premise that the observed zonal wave‐like structures in TEC are the manifestations of bottom side LSWS. Hence, the methodology presented in this paper, would prove useful in future, to study the characteristics of LSWS on a regular basis.