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With a favorable constellation of spacecraft and ground stations,\uda study is made on the global manifestations of a substorm onset. The\udonset occurred simultaneously and conjugately in both hemispheres,\udconfirmed by observations of the auroral breakup from IMAGE\udFUV-WIC and a sudden intensification of a westward electrojet from\udground-based magnetometers. Concurrently with the onset,\udfield-aligned and Hall currents in the auroral ionosphere are\udobserved by CHAMP, which are consistent with the signature of a\udHarang discontinuity. Immediately after the onset a magnetic field\uddipolarization is clearly observed by Double Star TC-1, located\udnear the central magnetotail and subsequently, by the Cluster\udquartet. The observations can be explained by a dawnward\udpropagation of the substorm current wedge at a speed of about 300 km/s

Global manifestations of a substorm onset observed by a multi-satellite and ground station network