Two-regime flux transfer events

We have examined a sizeable set of flux transfer event (FTE) signatures observed simultaneously by the ISEE 1 and ISEE 2 spacecraft when they were separated by large distances, of order a few thousand kilometres. In this paper we describe events in which simultaneous signatures were observed when the spacecraft were on opposite sides of the magnetopause. We call such events “two-regime” events. Sometimes clear events at one spacecraft are associated with weak perturbations at the other which do not satisfy the criteria used hitherto for FTEs. The data presented here are consistent with the interpretation that the perturbations are caused by a single reconnected flux tube which causes a disturbance on both sides of the magnetopause.