This dataset provides the supplementary information for the manuscript titled “Radio emissions reveal Alfvénic activity and electron acceleration prior to substorm onset.” It includes the following files: AKRprecursor_all_merged_v0604.pdf A comprehensive overview of all identified AKR precursor emissions observed prior to substorm onset and pseudo-breakup events. For each event, we present the dynamic spectrum, selected frequency-drifting features, fitted frequency drift rates (using second-order polynomials), and time intervals between successive drifting tones. MIRACLE_Beads_v0714.pdf A summary of all identified wave-like auroral events captured by the MIRACLE all-sky camera network, accompanied by relevant geomagnetic indices to provide context for each observation. MIRACLE_beads_All_saved_final_v0526.zip A collection of auroral images (where available) and corresponding movies for all wave-like aurora events included in this study.