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

Wang, H.; Ma, S. Y.; Lühr, H.; Liu, Z. X.; Pu, Z. Y.; Escoubet, C. P.; Frey, H. U.; Réme, H.; Ritter, P.

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

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Wang, H. / Ma, S. Y. / Lühr, H. / et al: Global manifestations of a substorm onset observed by a multi-satellite and ground station network. 2006. Copernicus Publications.

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