Abstract In this work, we investigate geomagnetic field and equatorial electrojet variations over Atlantic, Asian, and South American sectors during the storms of March and April 2023, and October 2024 using geomagnetic field data from six ground‐based stations. To gain insights and better understanding of the processes of the low‐latitude ionosphere and responses to interplanetary disturbances, we investigate solar and geomagnetic indices through cross‐correlation and Continuous Wavelet Transform (CWT) analyses. During all three storms, Interplanetary Magnetic field (IMF) B z component rapidly turned southward in the main phase, while solar wind velocity ( V sw ) and dynamic pressure ( P sw ) increased largely, generating Prompt Penetration Electric Fields (PPEFs) and Disturbance Dynamo Electric Fields (DDEFs). These external drivers controlled the Equatorial Electrojet (EEJ) showing pronounced longitudinal and local time dependency. Atlantic sector shows large correlations >0.9 between IMF B z and EEJ throughout the main phase of March and October storms, whereas the Asian and South American sectors show correlations in the range −0.6 to −0.7, and 0.7 to 0.8 respectively, during these storms. The CWT analysis of the EEJ variations for all sectors shows well‐defined periodicities at 2–4 hr and 4–8 hr, indicating persistent, large‐scale modulations in the equatorial ionospheric current system. This study shows that longitudinal EEJ variations during storms are affected by a complex combination of IMF B z direction, storm phase, local time, and regional electrodynamic conditions.
Sharma et al. (Fri,) studied this question.