On June 28, 2000, IMAGE watched a complicated and shifting ballet between electron and proton currents as they entered the atmosphere from space above the Arctic Region of Earth. The sudden brightening of the aurora at the beginning of the magnetic storm around midnight was only seen by IMAGE's FUV instrument which is sensitive to electron currents. The proton aurora is brighter on the dusk while the electron aurora on the dawn side. As the electron surge expands towards the pole it leaves the protons behind.
(2001: S. B. Mende, H. U. Frey, M. Lampton, J.-C. Gerard, B. Hubert, S. Fuselier, J. Spann, R. Gladstone, and J. L. Burch)