Midlatitude climatology of the ionospheric equivalent slab thickness over two solar cycles
Midlatitude climatology of the ionospheric equivalent slab thickness over two solar cycles
复制标题
两个太阳周期内电离层等效板片厚度的中纬度气候学
DOI：
10.1007/s00190-021-01577-7
复制
发表时间：
2021
影响因子：
4.4
通讯作者：
M. Pezzopane
中科院分区：
文献类型：
--
作者：
A. Pignalberi;B. Nava;M. Pietrella;C. Cesaroni;M. Pezzopane
分析了北半球中纬度地区电离层等效厚（τ）的主要气候学特征。利用三个中纬度电离层站（Chilton 51.5°N, 0.6°W，英国；Roquetes 40.8°N, 0.5°E，西班牙；Wallops岛37.9°N, 75.5°W，美国）记录的2层峰值电子密度值和配置的地面全球导航卫星系统接收器的垂直总电子含量值计算了最后两个太阳周期的τ值数据集，仅考虑磁静期。对于不同的太阳活动水平，结果以网格的形式呈现，并以箱形图的形式呈现，作为当地时间和月份的函数。相应的趋势首先与Fox等人开发的中纬度经验模型的输出结果进行比较（无线电科学26:29 - 438,1991），然后根据目前已知的情况进行讨论。从这项调查中，强烈需要实施一个改进的经验模型τ已经出现。空间气象和空间大地测量应用都可能受益于这种模型。因此，本文所描述的数据集和方法都是实现电离层等效板厚度经验气候学模型的第一个基本步骤。该研究还强调，在中纬度地区τ显示出以下主要模式：白天值明显小于夜间值（夏季除外）；在太阳黄昏时有明确定义的最大值；在夜间和太阳终结时弥散较大；没有明确和明显的太阳活动依赖性。
The main climatological features of the ionospheric equivalent slab thickness (τ) for the Northern hemisphere midlatitudes are analyzed. F2-layer peak electron density values recorded at three midlatitude ionospheric stations (Chilton 51.5° N, 0.6° W, U.K.; Roquetes 40.8° N, 0.5° E, Spain; Wallops Island 37.9° N, 75.5° W, USA) and vertical total electron content values from colocated ground-based Global Navigation Satellite System receivers are used to calculate a dataset ofτvalues for the last two solar cycles, considering only magnetically quiet periods. Results are presented both as grids of binned medians and as boxplots as a function of local time and month of the year, for different solar activity levels. Corresponding trends are first compared to those output by the midlatitude empirical model developed by Fox et al. (Radio Sci 26:429–438, 1991) and then discussed in the light of what is known so far. From this investigation, the strong need to implement an improved empirical model ofτhas emerged. Both Space Weather and Space Geodesy applications might benefit from such model. Therefore, both the dataset and the methodology described in the paper represent a first fundamental step aimed at implementing an empirical climatological model of the ionospheric equivalent slab thickness. The study highlighted also that at midlatitudesτshows the following main patterns: daytime values considerably smaller than nighttime ones (except in summer); well-defined maxima at solar terminator hours; a greater dispersion during nighttime and solar terminator hours; no clear and evident solar activity dependence.