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<p><strong>Abstract.</strong> Dipolarization, one of the main indicators of substorm expansion onset, represents topological changes in the magnetotail. It is believed that dipolarization is initiated at a longitudinally confined region in the tail, followed by the azimuthal expansion. There are very limited studies in the literature regarding the azimuthal propagation of the dipolarization front in the magnetotail. In this study we have used ten years of GOES data and POLAR and IMAGE data todoi:10.5194/angeo-27-1113-2009 fatcat:lsvkcfyrbzg4phqybfk5sxraue