根据太阳周期和地磁活动水平，赤道等离子体气泡在巴西上空具有特征

IF 2.6 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-24 DOI:10.3389/fspas.2023.1252511

C. S. Carmo, L. Dai, C. Denardini, C. Figueiredo, C. M. Wrasse, L. Resende, D. Barros, J. Moro, S. Chen, G. Picanço, R. P. Silva, C. Wang, H. Li, Z. Liu

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引用次数: 0

摘要

赤道等离子体气泡（EPBs）会导致信号退化，影响测量精度。研究EPBs及其特征变得越来越重要。在2014年7月至2015年7月（F10.7:145.9×10−22 W·m−2·Hz−1的太阳最大活动）和2019年7月–2020年7月，使用总电子含量率指数（TEC）图研究了EPBs在不同太阳和磁活动条件下的特征。我们还根据基于Kp和Dst（扰动风暴时间）指数的磁活动水平对该分析进行了划分，分为：安静+（Kp≤3，Dst>−30 nT）、安静−（Kp＜3，Dst＜−30 nT）、扰动弱（−50 nT＜Dst≤−30 nTs）、中等（−100 nT＜Dst≤−50 nTs）和强烈（Dst≤–100 nT）。ROTI是使用带有载波相位的倾斜TEC来计算的，其kegram用于提取纬向速度和距离。我们的统计调查显示了巴西地区EPBs的发生率、持续时间、纬向漂移速度和气泡间纬向距离。EPBs的纬向扩展和纬向漂移速度在太阳活动盛期高于太阳活动极小期。此外，EPBs的持续时间异常长，一直持续到早上（～12 UT），10%的EPB观测发生在冬至。

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Equatorial plasma bubbles features over the Brazilian sector according to the solar cycle and geomagnetic activity level

Equatorial plasma bubbles (EPBs) can lead to signal degradation, affecting the measurement accuracy. Studying EPBs and their characteristics has gained increasing importance. The characteristics of EPBs were investigated using the rate of total electron content (TEC) index (ROTI) maps under different solar and magnetic activity conditions during two periods: July 2014–July 2015 (solar maximum activity with F10.7: 145.9 × 10−22 W⋅m−2⋅Hz−1) and July 2019–July 2020 (solar minimum activity with F10.7: 69.7 × 10−22 W⋅m−2⋅Hz−1). We also divided this analysis according to the magnetic activity levels based on Kp and Dst (disturbance storm time) indices, classified as follows: quiet+ (Kp ≤3 and Dst >−30 nT), quiet− (Kp ≤3 and Dst <−30 nT), disturbed weak (−50 nT

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