A study of the ionogram derived effective scale height around the ionospheric hm F2
A study of the ionogram derived effective scale height around the ionospheric hm F2
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DOI：
10.5194/angeo-24-851-2006
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发表时间：
2006-05
影响因子：
1.9
通讯作者：
Lintao Liu;W. Wan;B. Ning
中科院分区：
文献类型：
--
作者：
Lintao Liu;W. Wan;B. Ning
抽象。本文统计分析了武汉（114.4° E，30.6° N）电离层F层峰附近的电离图标度高度（Hm）的日变化、季节变化和太阳活动变化，并对武汉和其他12个有Hm资料的台站的Hm的年变化进行了研究。Hm作为顶侧电子数密度剖面斜率的度量，是从底侧电子密度剖面计算的，该剖面是使用UMLCAR SAO-Explorer从垂直探测电离图得到的。结果表明，中值Hm的值随着太阳辐射通量的增加而增加。白天，Hm在夏季最高，冬季最低，而夜间的季节变化要小得多。这13个站的一个共同特点是Hm经历了每年的年变化，在夏季白天最大。从深夜到日出前，年变化变得很弱或消失。此外，Hm与hmF 2之间存在中等程度的正相关性，底侧厚度参数B 0与Hm之间存在较强的相关性。后者提供了一个新的和方便的方式来经验模拟顶侧电离层形状只从建立的B 0参数集。
Abstract. The diurnal, seasonal, and solar activity variations of the ionogram derived scale height around the ionospheric F-layer peak (Hm) are statistically analyzed at Wuhan (114.4° E, 30.6° N) and the yearly variations of Hm are also investigated for Wuhan and 12 other stations where Hm data are available. Hm, as a measure of the slope of the topside electron number density profiles, is calculated from the bottomside electron density profiles derived from vertical sounding ionograms using the UMLCAR SAO-Explorer. Results indicate that the value of median Hm increases with increasing solar flux. Hm is highest in summer and lowest in winter during the daytime, while it exhibits a much smaller seasonal variation at night. A common feature presented at these 13 stations is that Hm undergoes a yearly annual variation with a maximum in summer during the daytime. The annual variation becomes much weaker or disappears from late night to pre-sunrise. In addition, a moderate positive correlation is found between Hm with hmF2 and a strong correlation between the bottomside thickness parameter B0 and Hm. The latter provides a new and convenient way for empirical modeling the topside ionospheric shape only from the established B0 parameter set.