Local time and longitude dependence of the equatorial electrojet magnetic effects |
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| Affiliation: | 1. Laboratoire de Physique de l''Atmosphère, Université de Cocody-Abidjan, 22 BP 582, Abidjan 22, Ivory Coast;2. Département de Géophysique Spatiale et Planétaire, Institut de Physique du Globe de, 4, avenue de Neptune, 94107 Saint-Maur, Paris, France;3. Solid Earth Geomagnetism Division, Indian Institute of Geomagnetism, Colaba, Mumbai 400005, India;4. Department of Earth and Planetary Sciences, Kyushu University 33, 6-10-1 Hakozaki, Fukuoka 812-8581, Japan;1. School of Chemistry and Physics, University of KwaZulu–Natal, Durban, South Africa;2. Department of Physics, Kogi State University, Anyigba, Nigeria;1. Fuji Security Systems Co. Ltd., Iwato-cho 9, Shinjuku-ku, Tokyo 162-0832, Japan;2. Earthquake Analysis Laboratory, Information Systems Inc., Kita-aoyama 2-12-42-305, Minato-ku, Tokyo 107-0061, Japan;3. Hayakawa Institute of Seismo Electromagnetics, Co. Ltd., UEC, Incubation Center, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan;4. UEC, Advanced Wireless Communications Research Center, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan;1. Department of Electrical Engineering, Tohoku University, 6-6-05, Aoba, Aramaki, Aoba-ku, Sendai, Miyagi, 980-8579, Japan;2. National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8560, Japan;3. Minimal Fab Promoting Organization, 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8560, Japan |
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| Abstract: | An empirical model of the equatorial electrojet (EEJ), including local time and longitude dependence, has been constructed based on the surface magnetic data recorded at 26 stations located in six different longitude sectors that were set up or augmented during the international equatorial electrojet year (IEEY). The model reproduces the characteristic signatures of the EEJ-associated horizontal and vertical magnetic components at ground level. The model-predicted variations at the orbit of the POGS satellite are generally in good agreement with the onboard magnetic signatures, although strong discrepancies are also often seen. The nature of the differences suggests that the global scale magnetospheric or field-aligned current systems may sometimes dominate the satellite data. The nature of the longitudinal inequalities in the EEJ strength indicates that the equatorial electrojet is strongest in South America (80°–100°W) and weakest in the Indian sector (75°E) with a secondary minimum and a maximum centered, respectively, in the Atlantic Ocean (30°W) and in western Africa (10°E). The EEJ strength is shown to be inversely correlated with the main field intensity along the dip-equator. |
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