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针对电离层对无线电波应用技术的影响,该文利用IGS提供的1998年—2012年的全球电离层TEC数据,结合相应的太阳活动数据,采用时间序列分析、相关性分析以及等值线图等数理统计的方法,分析了全球电离层的时变特性;分析了电离层TEC、F10.7和太阳黑子数的相关性,发现3者之间的相关系数高度线性相关。通过电离层日变化规律的研究发现:电离层TEC日极大值出现的时刻集中在当地时间12时至16时,其中14时占38.47%,12时占26.58%,16时占19.05%;夜间TEC值与太阳活动强度密切相关,在太阳活动低峰年,夜间全球电离层TEC平均值在5TECU左右,在太阳活动高峰年,夜间全球电离层TEC平均值在17TECU左右,最大值可达24TECU。最后,从日地距离和太阳活动强度两个方面,讨论了全球电离层TEC季节变化规律以及成因。
In view of the influence of ionosphere on the application of radio waves, this paper makes use of global ionospheric TEC data from 1998 to 2012 provided by IGS, with corresponding solar activity data, time series analysis, correlation analysis and contour map The statistical analysis of the global ionospheric time-varying characteristics of the ionosphere TEC, F10.7 and the sunspot number of the correlation and found that the correlation coefficient between the three highly linear correlation. According to the diurnal variation of ionosphere, it is found that the maximum values of ionospheric TEC concentration occur at 12 o’clock to 16 o’clock local time, of which 14.4%, 26.58% and 19.05% respectively at night, The TEC value is closely related to the solar activity intensity. During the low solar activity, the average global TEC at night is about 5 TECU. At the peak of solar activity, the average global TEC at around 17 TECU at night is up to 24 TECU. Finally, from the aspects of the distance between the sun and the earth and the intensity of the solar activity, we discuss the seasonal variations of the TEC in the global ionosphere and their causes.