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利用美国NOAA和澳大利亚IPS提供的foF2实测数据,研究中国低纬地区foF2数据缺失的分布特征以及产生缺失的相关原因.结果表明:(1)foF2缺失是一个夜间现象,白天的缺失远比晚上少,并且在夏季的6或7月份的缺失最多、春秋季月份缺失较多、冬季月份则较少;(2)从一个太阳周期变化上看,foF2的缺失与太阳黑子数有着相反的变化规律,即太阳黑子数越高foF2的数据缺失越少,反之则越高.(3)foF2晚上时段的缺失在午夜前和午夜后的分布有明显不同,表现为夏季时段,午夜后的缺失占据主导;而在春秋季节,则表现为午夜前的缺失占据主导.通过分析研究,我们得到的结论是晚间foF2缺失的直接原因是扩展F层的出现所造成,并且不同类型的扩展F层造成的缺失分布也会不一样.统计表明,晚间foF2缺失与扩展F层的相关系数高达0.93.本文第一次从数据缺失上,对中国低纬地区foF2实测数据进行研究,得到比较完整的缺失分布特征,并给出了产生缺失的原因,可能对以后的研究有一定的参考意义.
Using the data of foF2 provided by the NOAA of the United States and the Australian IPS, the distribution characteristics of foF2 data in low latitudes in China and the related causes of the deletions were studied.The results showed that: (1) foF2 deletion was a nocturnal phenomenon with a much less deficit in daytime than in night , With the most missing in June or July in summer, the more missing in spring and autumn months and the less in the winter months; (2) The change of foF2 has the opposite trend with sunspot number from a solar cycle change, Ie, the higher the number of sunspots, the less foF2 is missing, and vice versa. (3) The distribution of foF2 in nighttime is obviously different before midnight and after midnight, which is manifested in the summer time, and the loss after midnight dominates. In the spring and autumn, however, the predominance of the absence before midnight dominates, and we conclude that the direct cause of foF2 loss in the evening is due to the presence of extended F-stratum, and the lack of distribution due to different types of extended F-stratum Will be different.Statistics show that night foF2 loss and extension of the correlation coefficient F layer as high as 0.93 for the first time from the lack of data on the low latitude in China foF2 measured data Research, get a more complete distribution of the lack of distribution, and gives the reasons for the loss, may have some reference for future research.