A Model for Confined Solar Eruptions Including External Reconnection

Abstract The violent disruption of the coronal magnetic field is often observed to be restricted low corona, appearing as a confined eruption. possible causes confinement remain elusive. Here, we model eruption flux rope in quadrupolar active region, with parameters set such that X-lines exist both below and above rope. This facilitates onset reconnection either place but partly opposing effects on lower initially adds poloidal rope, increasing upward hoop force supporting rise However, when side lobes enters reconnection, found separate from site accumulation ceases. At same time, upper begins reduce decreasing its force; eventually this cuts completely. relative weight two processes varied model, it their combined effect tension overlying confine if ratio outer inner polarities exceeds threshold, which ∼1.3 for our Cartesian box chosen parameters. We hence propose external between an erupting can play vital role confining eruptions.