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We conducted a statistical analysis of the geomagnetic field variationsduring the storm main phase at two low-latitude stations, separated byseveral hours in magnetic local time, in order to investigate the asymmetryand longitudinal extent of the storm-time ring current. The results showevidence for an asymmetric current which typically extends from evening tonoon and, during moderate solar wind electric field conditions, up to theearly morning, confirming the important role of the magnetosphericconvection in the ring current energization. We also analyzed a possiblerelationship between the local current intensity during the storm main phaseand the substorm activity observed at different time delays τ withrespect to the storm onset. The results show a significant anticorrelationfor τ =-1h, indicating that if the substorm activity is high justbefore the storm, a weaker ring current develops

The storm-time ring current: a statistical analysis at two widely separated low-latitude stations