西北走廊地区电离层吸收特性研究
doi: 10.11728/cjss2025.04.2024-0075 cstr: 32142.14.cjss.2024-0075
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辛浩 男, 1981年1月出生于河南省平顶山市, 现为平顶山工业职业技术学院讲师, 主要研究方向为无线电通信、网络安全技术、电离层电波传播等. E-mail: aurorx@qq.com -
赵海生 男, 1981年6月出生于河南省平顶山市, 现为海南大学电子科学与技术学院研究员, 海南省领军人才, 博士生导师, 主要研究方向为电离层环境探测、电离层电波传播等. 通信作者, E-mail: zhaohaisheng213@163.com
作者简介:
Study on Ionospheric Absorption Variation Characteristics in the Northwest Corrido
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摘要: 电离层fmin是频高图上观测到的回波最低频率, 是电离层垂直探测仪性能的一个重要指标, 也是电离层D区吸收效应研究的重要指标. 本文利用中国电离层垂测站网位于西北走廊地区的西安、乌鲁木齐、兰州三个台站电离层fmin数据, 研究了西北走廊地区电离层吸收的强度特性、空间分布特性、日变化、季节变化及长期变化特性. 开展电离层吸收变化特性研究, 对研究短波通信最低频率选择、天波超视距雷达探测性能评估、甚低频(VLF)远程通信效能预测具有重要应用价值. 同时电离层吸收与D层电子密度关系紧密, 是D层电子密度强弱的重要指标, 开展电离层吸收特性研究, 对于研究D区电离层变化特性, 建立D区电子密度分布模型具有重要科学意义.Abstract: Ionospheric fmin is the lowest echo frequency observed on the frequency height map, which is an important index of the performance of the ionosonde and also an important index for the study of the absorption effect in the ionospheric D region. In this paper, the ionospheric absorption intensity, spatial distribution, diurnal variation, seasonal variation and long-term variation are studied by using ionospheric fmin data from Xi’an, Urumqi and Lanzhou stations of China Ionospheric vertical survey network in the Northwest Corridor region. The study of ionospheric absorption variation is of great application value to the selection of the lowest frequency of shortwave communication, the evaluation of detection performance of sky-wave over-the-horizon radar and the prediction of VLF telecommunication efficiency. At the same time, ionospheric absorption is closely related to the electron density of the D layer, which is an important indicator of the intensity of the electron density of the D layer. To study the ionospheric absorption characteristics is of great scientific significance for the study of the ionospheric variation characteristics and the establishment of the electron density distribution model in the D region. The absorption effect of ionospheric region D in the Northwest Corridor mainly occurs in the daytime, with the highest absorption intensity at noon and the weakest in the early morning at night. Meanwhile, the absorption effect of ionospheric region D in the Northwest Corridor has significant seasonal variation characteristics, the strongest in summer and the weakest in other seasons. The ionospheric fmin value of Urumchi at higher latitude is obviously higher than that of Xi’an and Lanzhou at middle latitude, and the absorption effect center has obvious diurnal drift characteristics. The absorption of ionospheric region D in the Northwest Corridor is positively correlated with the intensity of solar activity. In particular, the absorption intensity of ionospheric region D in high solar activity years is significantly higher than that in low solar activity years.
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Key words:
- Northwest corridor /
- Ionospheric fmin /
- Daily variation /
- Seasonal change /
- Long-term trend /
- Spatial distribution
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图 2 西北走廊地区fmin月均值分布
Figure 2. Distribution of fmin average values in Northwest Corridor
图 3 西北走廊地区电离层fmin全年平均值分布
Figure 3. Distribution of fmin annual average in Northwest Corridor
图 4 西北走廊地区电离层fmin均值日变化曲线
Figure 4. Daily variation curve of ionospheric fmin in the northwest Corrido
图 5 西北走廊地区电离层fmin均值的昼夜变化
Figure 5. Diurnal variation of ionospheric fmin in the Northwest Corridor
图 6 西北走廊地区电离层fmin均值的季节变化
Figure 6. Seasonal variation of ionospheric fmin in the Northwest Corridor
图 7 西北走廊地区电离层fmin均值夏冬对比
Figure 7. Comparison of ionospheric fmin values in summer and winter in the Northwest Corridor
图 8 西北走廊地区电离层fmin太阳周期变化特性
Figure 8. Variation characteristics of ionospheric fmin solar cycle in the Northwest Corridor
图 9 西北走廊地区电离层fmin长期变化特性
Figure 9. Long-term variation characteristics of ionospheric fmin in the Northwest Corridor
表 1 电离层fmin观测站与数据年限
Table 1. Ionospheric observation stations and data duration of fmin
序号 站名 经度/(°N) 纬度/(°E) 数据年限 1 西安 34.23 108.92 2013－2022年 2 乌鲁木齐 43.75 87.63 2013－2022年 3 兰州 36.06 103.87 2013－2021年 
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