【作者】 占亮； 刘立波； 万卫星； 赵必强；

【Author】 ZHAN Liang~(1,2,3) LIU Libo~1 WAN Weixing~1 ZHAO Biqiang~1 1(Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029) 2(Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences) 3(Graduate University of Chinese Academy of Sciences)

【机构】 中国科学院地质与地球物理研究所； 中国科学院武汉物理与数学研究所； 中国科学院研究生院；

【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F₂层临界频率f₀F₂参数,统计分析了Kokubunji站电离层F₂层峰值电子浓度N_mF₂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_mF₂扰动与a_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3h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.更多还原

【Abstract】 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 N_mF₂ 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 Kokubunji.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 N_mF₂ and a_p 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.更多还原