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The dynamics of the energy-latitude dispersed sub-keV trapped ions inside thering current region, the so-called wedge-like dispersions structure, werestatistically studied using Viking satellite data. Probabilities with/withoutthese signatures at various local times in the dayside are obtained in termsof different time-lags from the substorm activity monitored by the AE index.The structure appears in the early morning sector within a few hours afterthe substorm, and it slowly propagates eastward while decaying with a time scaleof several hours. The result qualitatively confirmed the previous model thatthe wedge-like dispersions are originated from past substorm-related plasmainjections into the nightside ring current region, and that the dispersion isformed when these injected plasma slowly moves eastward to the dayside by thedrift motion (E×B (eastward), grad-<|B| (westward), andcurvature (westward) drifts). However, the appearance of the structure istwice or three times faster than the model prediction, and some structurereaches even to the evening sector. The results indicate that the startlocation of the drift is not as far as midnight and that the drift speed isslightly faster than the model prediction. The former means that thesubstorm-related increase of hot plasma in the ring current region shifts orextends to the early morning sector for large substorms, and the latter meansthat the substantial electric field driving the sub-keV ion drift is slightlydifferent from the model field. We also detected the evacuating effectstarting right after the substorm (or storm) onset. The electric fieldimposed in the dayside magnetosphere seems to remove the remainder of trappedions

Sub-keV ring current ions as the tracer of substorm injection