Equatorial electrojet in the south Atlantic anomaly region

Journal of Earth system science

N B Trivedi2³  V Doumbia3²  H Chandra1¹  R G Rastogi1¹ 

[1] Physical Research Laboratory, Ahmedabad 380 009, India.$$;Universite de Cocody, Abidjan, Ivory Coast.$$;INPE, CP 515, Sao Jose dos Campos, SP, Brazil$$

关键词: Equatorial electrojet;    Brazilian anomaly in equatorial electrojet;    asymmetries in equatorial electrojet.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Features of the equatorial electrojet are studied at Sao Luiz (2.6°S, 44.2°W, inclination −0.25°) in eastern Brazil and Sikasso (11.3°N, 5.7°W, inclination 0.1°) in the western African sector. The stations are situated on either side of the lowest magnetic field intensity in the region of rapid changes in the declination. The daily variations of 𝛥 X at the two stations are almost similar with the peak around noon with maximum values during equinoxes and minimum values during J-solstices. Daily variations of 𝛥 Y differ with the maximum deviation of about −35 nT around noon at Sao Luiz and much smaller value of about −10 nT around 14 h LT for Sikasso. The direction of the 𝐻 vector varies from 15°W of north at 08 h to more than 30°W of north at 17 h for Sao Luiz and from 14°E of north to 25°W of north at 18 h for Sikasso. The plot of the deviations in 𝛥 X and 𝛥 Y at different hours for the two stations shows the points along narrow ellipses with major axis aligned along 22°W of north for Sao Luiz and along 3°W of north for Sikasso as compared to declination of 20°W for Sao Luiz and 6°W for Sikasso. The deviations in 𝛥 X at the two stations are fairly well correlated.

【 授权许可】

Unknown