中国典型区域Es特性研究

利用中国海口、长春和拉萨三个站1976-1986年一个太阳周的观测数据, 对中国典型区域的Es特性进行了研究. 分析了不同强度Es (f₀E_s > 3, 5, 7, 9MHz)出现概率随本地时、季节以及太阳活动的变化规律, 并对电离层Es遮蔽情况(包括全遮蔽和半遮蔽)进行了系统分析. 研究结果表明, 各种强度的Es出现概率均是白天大于夜间, 夏季高于其他季节, 随太阳活动性变化规律不明显, 地区差异较大, 大部分情况拉萨站Es出现概率最高; 对于全遮蔽和半遮蔽特性, 不同站也表现出不同的分布规律. 

Investigation on Es Properties in Representative Region of China

In this paper, the characteristics of sporadic E layer (Es) is discussed, using data measured from China vertical stations of Haikou (20.02°N, 110.20°E), Lhasa (29.39°N, 91.08°E) and Changchun (43.54°N, 125.19°E) for one solar period between January 1976 and December 1986. The diurnal, seasonal and solar activity variations of Es occurrence probability with critical frequencies greater than several special values (f₀E_s > 3, 5, 7, 9MHz) are discussed. The obscure property is also analyzed. The results show that: the most significant occurrence probability presented during daytime in summer months, and does not depend significantly on solar activity. The distribution regularity is of great difference with different stations, and in most cases, Lhasa has the biggest occurrence probability. As to the blanketing property, three stations also have different distribution characteristics, except for that the obscure probability in summer is bigger than other seasons and is bigger in solar minimum than solar maximum too.