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Evaluation of Different Methods for Calculating the ROTI Index Over the Brazilian Sector
Radio Science ( IF 1.6 ) Pub Date : 2021-06-16 , DOI: 10.1029/2020rs007140
C. S. Carmo 1 , C. M. Denardini 1 , C. A. O. B. Figueiredo 1 , L. C. A. Resende 1, 2 , G. A. S. Picanço 1 , P. F. Barbosa Neto 1, 3 , P. A. B. Nogueira 4 , J. Moro 2, 5 , S. S. Chen 1
Affiliation  

Ionospheric irregularities as plasma bubbles occur in the ionosphere, and generally, they are characterized by the low plasma density regions. The Rate Of TEC Index (ROTI) was defined in terms of the Total Electron Content (TEC) variation and is used to characterize these plasma bubbles. It is essential to evaluate the ROTI behavior since the ionospheric irregularities can cause fluctuations in the radio signal, interfering in the ionospheric data analysis. Therefore, we performed in this work a comparative study of five different methods available to calculate the ROTI to evaluate the most suitable over the Brazilian region. The ROTI was calculated over three GNSS stations at different latitudes: São Luís (SALU, 2°31′S, 44°16′W; dip: −3.8°), Cachoeira Paulista (CHPI, 22°40'S, 44°59'W; dip: −36.4°), and Santa Maria (SMAR, 29°41′S, 53°48′W, dip: −37°). The results show that the most viable method for calculating ROTI in the Brazilian region is based on the Slant TEC equation as defined by Cherniak et al. (2018), https://doi.org/10.1007/s10291-018-0730-1. Our results are supported by the comparison between the ROTI with TEC maps, ionograms collected at Fortaleza (FZA0M, 3°43'S, 38°32'W, dip: −15.8°), SALU, and CHPI and All-Sky imagers collected at the São João do Cariri (SJCA, 7°23'S, 36°31'W, dip: −11°) and CHPI. Additionally, we observe Equatorial Plasma Bubbles (EPBs) in the Brazilian region using the ROTI index map.

中文翻译:

对计算巴西部门 ROTI 指数的不同方法的评估

在电离层中出现作为等离子体气泡的电离层不规则性,并且通常以低等离子体密度区域为特征。TEC 率指数 (ROTI) 是根据总电子含量 (TEC) 变化定义的,用于表征这些等离子体气泡。必须评估 ROTI 行为,因为电离层不规则会导致无线电信号波动,干扰电离层数据分析。因此,我们在这项工作中对可用于计算 ROTI 的五种不同方法进行了比较研究,以评估最适合巴西地区的方法。ROTI 是在不同纬度的三个 GNSS 站上计算得出的:São Luís(SALU,2°31'S,44°16'W;倾角:-3.8°),Cachoeira Paulista(CHPI,22°40'S,44°59'W ; 倾角:-36.4°) 和圣玛丽亚 (SMAR, 29°41'S, 53°48'W, 倾角:-37°)。结果表明,在巴西地区计算 ROTI 最可行的方法是基于 Cherniak 等人定义的 Slant TEC 方程。(2018 年),https://doi.org/10.1007/s10291-018-0730-1。我们的结果得到了 ROTI 与 TEC 地图、在 Fortaleza(FZA0M,3°43'S,38°32'W,倾角:-15.8°)、SALU 和 CHPI 和全天成像仪收集的电离图之间的比较的支持。 São João do Cariri(SJCA,7°23'S,36°31'W,倾角:-11°)和 CHPI。此外,我们使用 ROTI 指数图观察巴西地区的赤道等离子体气泡 (EPB)。我们的结果得到了 ROTI 与 TEC 地图、在 Fortaleza(FZA0M,3°43'S,38°32'W,倾角:-15.8°)、SALU 和 CHPI 和全天成像仪收集的电离图之间的比较的支持。 São João do Cariri(SJCA,7°23'S,36°31'W,倾角:-11°)和 CHPI。此外,我们使用 ROTI 指数图观察巴西地区的赤道等离子体气泡 (EPB)。我们的结果得到了 ROTI 与 TEC 地图、在 Fortaleza(FZA0M,3°43'S,38°32'W,倾角:-15.8°)、SALU 和 CHPI 和全天成像仪收集的电离图之间的比较的支持。 São João do Cariri(SJCA,7°23'S,36°31'W,倾角:-11°)和 CHPI。此外,我们使用 ROTI 指数图观察巴西地区的赤道等离子体气泡 (EPB)。
更新日期:2021-07-28
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