摘要
利用日本Kokubunji站(139.5°E,35.5°N)1959年1月到2004年12月共46年的F_2层临界频率f_0F_2参数,统计分析了Kokubunji站电离层F_2层峰值电子浓度N_mF_2随地磁活动、太阳活动、季节和地方时变化的形态特征.结果表明,总体来看,磁暴期间Kokubunji站电离层响应以正暴为主,其中在太阳高年夏季为负暴,冬季为正暴,春秋季以负暴为主但幅度较小;在太阳低年夏季以正暴为主,冬季为正暴,春秋季以正暴为主.N_mF_2扰动与α_p指数在夏季太阳高年负相关,在冬季无论太阳高年低年均为正相关,春秋季中4月和9月在太阳高年类似夏季,3月和10月在太阳低年类似冬季.电离层最大负相扰动对最大地磁活动的延迟时间约为12～15 h;正相扰动的延迟时间则分别为3 h和10 h.地磁活跃期间地方时黄昏后到午夜前倾向于正相扰动,清晨倾向于负相扰动.
In this paper, with the observed critical frequencies of F2 layer at Kokubunji （139.5°E,35.5°N） during 1959 to 2004, the dependence of the variations of NmF2 on the geomagnetic activity, solar activity, season and local time are statistically investigated. The results show that there are more positive ionospheric storm effects than negative ones over KokuSunji. In summer, negative storm effects prevail during high solar activity, whereas positive storm effects are usually observed during low solar activity; in winter, positive storm effects dominate regardless of solar activity conditions; and in equinox, negative storm effects with smaller amplitude are often seen during high solar activity, and positive storm effects often take place during low solar activity conditions. The correlation analysis between the disturbance of NmF2 and ap index also illustrates the above-mentioned feature. Furthermore, our results show that there is a time delay of 12-15 hours between the ionospheric maximum negative disturbances and the maximum geomagnetic perturbation, and the time delay of the ionospheric positive disturbances are 3 and 10 hours, respectively. In addition, it is also found that under high geomagnetic activity conditions, positive disturbances are often seen in the evening, and negative disturbances in the morning.
出处
《空间科学学报》
CAS
CSCD
北大核心
2007年第5期391-399,共9页
Chinese Journal of Space Science
基金
国家自然科学基金项目(40574071
40636032)
国家重点基础研究规划项目(2006CB806306)共同资助
关键词
NmF2
电离层扰动
统计分析
NmF2, Ionospheric disturbances, Statistical analysis
