This research report presents a new interactive visualisation technique for exploring plasma behaviors resulting from 4-D+t numerical simulations on regular grids. Therefore, a new out-of-core 4-D+t scalar field visualisation technique, based on a « focus and context » approach is presented. The latter uses a hybrid data compression method. The originality of this work precisely consists in coupling the 3-D visualization with the progressive load and decompression of data in such a way that it still guarantees real-time framerates even on low-end PCs while maintaining a high degree of numerical precision.