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The role of ideal-MHD instabilities in a prominence eruption is explored through 2D and 3D kinematic analysis of an event observed with the Solar Dynamics Observatory and the Solar Terrestrial Relations Observatory between 22:06UT on 2013 February 26 and 04:06UT on 2013 February 27. A series of 3D radial slits are used to extract height–time profiles ranging from the midpoint of the prominence leading edge to the southeastern footpoint. These height–time profiles are fit with a kinematic model combining linear and nonlinear rise phases, returning the nonlinear onset time (tnl) as a free parameter. A range (1.5–4.0) of temporal power indices (i.e., β in the nonlinear term b t tnl ( ) ) are considered to prevent prescribing any particular form of nonlinear kinematics. The decay index experienced by the leading edge is explored using a radial profile of the transverse magnetic field from a PFSS extrapolation above the prominence region. Critical decay indices are extracted for each slit at their own specific values of height at the nonlinear phase onset (h(tnl)) and filtered to focus on instances resulting from kinematic fits with c < 2 red 2 (restricting β to 1.9–3.9). Based on this measure of the critical decay index along the prominence structure, we find strong evidence that the torus instability is the mechanism driving this prominence eruption. Defining any single decay index as being “critical” is not that critical because there is no single canonical or critical value of decay index through which all eruptions must succeed. Unified Astronomy Thesaurus concepts: Solar prominences (1519); Solar magnetic fields (1503); The Sun (1693); Solar atmosphere (1477)

2D and 3D Analysis of a Torus-unstable Quiet-Sun Prominence Eruption