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Tomographic imaging of the equatorial and low-latitude ionosphere over central-eastern Brazil

机译：巴西中东部赤道和低纬电离层的层析成像

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摘要

A four-dimensional time-dependent tomographic algorithm, named Multi Instrument Data Analysis System (MIDAS), is used to image the equatorial and low-latitude ionosphere over the central-eastern sides of the Brazilian territory. From differential phase data obtained by a chain of ground-based GPS receiver the total electron content (TEC) is estimated and then, together with a modeled ionosphere from International Reference Ionosphere (IRI) model, the electron density distribution is reconstructed and the parameters of the F _2-peak layer are accessed from the images. This paper presents the first study of ionospheric tomography using real dual-frequency data from the Brazilian Network for Continuous GPS Monitoring (RBMC). Ionospheric Fipeak electron density (N_mF_2) accessed from the images are compared to concurrent measurements from three ionosondes installed across Brazil. One year of data during the solar maximum period from March/2001 to February/2002 is used to analyze the seasonal and hourly variation of the F _2-layer peak density. The accuracy with which MIDAS images the electron density during geomagnetic quiet periods is investigated through its correlation and deviation with the ionosonde and IRI model data, respectively. The main aspects of the reconstruction results at the equatorial ionization anomaly (EIA) region over Brazil are highlighted and discussed.
机译：一种名为“多仪器数据分析系统”（MIDAS）的四时依赖时间的层析成像算法，用于对巴西领土中东部两侧的赤道和低纬度电离层成像。根据地面GPS接收器链获得的差分相位数据，估算总电子含量（TEC），然后与根据国际参考电离层（IRI）模型建模的电离层一起，重建电子密度分布，并计算参数从图像访问F _2峰层。本文介绍了使用来自巴西连续GPS监测网（RBMC）的真实双频数据进行的电离层层析成像的首次研究。从图像中获取的电离层Fipeak电子密度（N_mF_2）与来自巴西各地安装的三个离子探空仪的同时测量值进行了比较。从2001年3月/ 2002年2月/日的太阳最大时期的一年数据用于分析F _2层峰值密度的季节性和每小时变化。通过分别与离子探空仪和IRI模型数据之间的相关性和偏差，研究了MIDAS在地磁静止期成像电子密度的准确性。重点介绍并讨论了巴西赤道电离异常（EIA）区域重建结果的主要方面。

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