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

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Abstract

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., Liu, Z. X., Pu, Z. Y., Escoubet, C. P., … Ritter, P. (2006). Global manifestations of a substorm onset observed by a multi-satellite and ground station network. Annales Geophysicae, 24(12), 3491–3496. https://doi.org/10.5194/angeo-24-3491-2006

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