Peak time of equatorial electrojet from different longitude sectors during fall solar minimum

[摘要] Equatorial electrojet is an eastward flowing current at about ±3° dip equator. This current intensity is always higher during noontime as it is greatly influenced by the ionization of Earth ionosphere. Apart from that, previous study had shown that EEJ current varies with longitude and latitude as well as solar cycle. The aim of this study is to investigate the peak time of EEJ current at different longitude sectors using simultaneous data in 2009. By eliminating Sq current contribution and normalizing ground-based data from MAGDAS/CPMN, IIG and WDC network, we managed to reach our purpose and gain reliable output. We found out that EEJ is strongest in South American sector. Our results show that the peak EEJ during fall solar minimum is observed at 11 LT for South American, Indian and Southeast Asian sector but it is 1 hr earlier in African sector.

[发布机构] School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, Selangor; 43600 UKM, Malaysia^1;Department of Earth and Planetary Sciences, Faculty of Sciences, 33 Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka; 812-8581, Japan^2;International Center for Space Weather Science and Education, Kyushu University 53, 6-10-1 Hakozaki, Higashi-ku, Fukuoka; 812-8581, Japan^3

[效力级别] 无线电电子学

[关键词] Current intensity;Dip equator;Equatorial electrojet;Ground-based data;Solar cycle;Solar minima