Fig. 3
a X-component of the magnetic fields at the low latitude (San Juan, SJG) and equator (Huancayo, HUA) in the American zone located on the dayside (1330 MLT) when the geomagnetic storm occurred on 22 June, 2015. The EEJHUA denotes the equatorial electrojet defined as the difference between XHUA and XSJG. b Same parameters for the low latitude (Alibag, ABG) and equator (Tirunelveli, TIR) in the Indian zone located in the midnight (00–02 MLT) and for the low latitude (Kanoya, KNY) and equator (Guam, GUA) in the western Pacific zone, located in the pre-dawn (03–05 MLT). c X and Y components of the magnetic field at middle latitudes, Honolulu (HON) in the morning (09 MLT) and at Hartland (HAD) in the evening (19MLT)