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    Temporal evolution of the electric field accelerating electrons away from the auroral ionosphere

    The bright night-time aurorae that are visible to the unaided eye are caused by electrons accelerated towards Earth by an upward-pointing electric field1,2,3. On adjacent geomagnetic field lines the reverse proce...

    G. T. Marklund, N. Ivchenko, T. Karlsson, A. Fazakerley, M. Dunlop in Nature (2001)