Characteristics of Ionospheric Multiparameter Changes in Qujing Area
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摘要: 利用电波环境观测网曲靖站电离层垂直探测仪数据（2008－2018），分析了该站电离层多参数（包括fmin，f0Es，h'Es，f0E，f0F1，f0F2，h'F，MUF(3000)F2等）随太阳活动、季节、地方时的变化特征。结果表明，fmin，f0Es，h'Es随太阳活动变化不明显，f0E，f0F1，f0F2，h'F，MUF(3000)F2与太阳活动变化具有相关性，f0F2经常发生日落增强现象，同时各自具有独立性；与拉萨、乌鲁木齐地区f0F2，h'F，f0Es变化特征对比，发现地方时与月份变化趋势相同，但是极值出现的位置有所不同，这可能与各地区的地理纬度和地形等因素有关；h'F夜间大于白天，在日出日落时段有突然上升现象，冬季的h'F一般都小于其他季节；MUF(3000)F2与f0F2的变化特征相似，白天值高于夜晚值，春秋分季高于夏冬季，太阳活动高年日落后MUF(3000)F2一直维持较高值并持续到03:00－04:00 LT。Abstract: The Qujing ionospheric vertical sounders 11 years data in network of radio environment observatories are processed. The correlations between ionosphere parameters and solar activity month local time are analyzed including fmin, f0Es, h'Es, f0E, f0F1, f0F2, h'F, MUF(3000)F2. Several interesting results are achieved. Firstly, the relationships between fmin, f0Es, h'Es and solar activity are not obvious, but f0E, f0F1, f0F2, h'F, MUF(3000)F2 have good correlation with solar activity. Secondly, the value of f0F2 parameter often enlarged on sunset, and both are independent. The f0F2, h'F, MUF(3000)F2 parameters variation trend of Lhasa and Urumqi are compared, it is found that the variation trend of local time and month are similar, but extreme values appeared in different positions. This phenomenon may have a relationship with topography and latitude and longitude. Thirdly, the daytime value of h'F is smaller than night, and rise abruptly at sunrise and sunset, and the winter h'F value is smaller than other seasons. Fourthly, the change trend of MUF(3000)F2 is similar with f0F2, the daytime value is higher than night, the equinox value is higher than summer and winter, and the MUF(3000)F2 value in high solar activity year is high till 03:00－04:00 LT on the morning.
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Key words:
- Qujing /
- Ionosphere /
- Vertical sounders /
- Arameter features
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图 1 2008－2018年太阳活动指数F10.7月中值
Figure 1. Monthly median of solar activity index F10.7 from 2008 to 2018
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