摘要
通过对 1 95 7— 1 990年 3个太阳黑子周期期间不同纬度台站的ES 层的临界频率f0 ES 的观测数据进行统计分析 ,研究了太阳活动对ES 层的强度与出现率的影响 ,主要结果为 :f0 ES 的年平均值在白天与太阳活动呈强正相关 ,在夜间呈负相关 .同样 ,ES 的出现率的年变化与太阳活动的关系也是白天呈正相关 ,夜间呈负相关 .进一步分析表明 ,上述白天ES层临界频率与太阳活动的正相关性的主要贡献来自于常规E层与太阳活动的强烈相关性 .消除了背景E层电子密度的作用后 ,ES 层的强度在白天与太阳活动呈微弱的正相关 ,在夜间呈负相关 ,其相关系数有比较规则的周日变化或半日变化 .
In this paper studies the correlation between solar activity and the intensity of sporadic E-layers by analyzing the global network data of critical frequency of E_S-layer during three solar cycles (1957\_1990). It is obtained that the yearly average of f_0E_S is correlated with solar activity in daytime,and anti-correlated at night. Meanwhile,the occurrence of sporadic E-layers has a positive correlation with solar activity in daytime and negative at nighttime. Detailed analysis shows that the discovered strong positive correlation of f_0E_S with solar activity in daytime is mainly caused by the contribution of regulat E-layers which are deeply controlled by solar activity. When eliminating the contribution of regular E-layers,the intensity of sporadic E-layer is slightly positively correlated with the yearly averaged sunspots number in daytime and negatively correlated at night. The correlation coefficient has a regular diurnal or semi-diurnal variation pattern.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第6期759-765,共7页
Chinese Journal of Geophysics
基金
国家自然科学基金项目 (4 99740 3 9
40 1 3 40 2 0 )
国家重点基础研究规划项目 (G2 0 0 0 0 7840 7) .
