ANALYSIS OF THE EQUIVALENT CURRENTS SYSTEM SQ BEHAVIOUR PRODUCED BY THE FIRST SHOCK FRONT ARRIVAL FROM A G5 GEOMAGNETIC STORM

The geomagnetic storm that occurred between May 10 and 12, 2024, composed of several coronal mass ejections, s one of the most intense of this century, reaching levels G4 to G5 on the NOAA classification scale. Since the ejecta have supersonic speeds, they cause a shock wave. Upon reaching the terrestrial environment, it produces significant variations in the geomagnetic field. In the present paper it is analyzed the perturbation of the system of equivalent ionospheric currents due to the arrival of the first shock wave, using the records of ten permanent geomagnetic stations. In order to provide a possible interpretation of the relationships that could be established during the first hour after the arrival of the shock wave, the linking model among the different systems of equivalent currents and the different geomagnetic indices that represent them, is postulated