OVATION-SM: A model of auroral precipitation based on SuperMAG generalized auroral electrojet and substorm onset times

摘要

OVATION-SM, an empirical model for different types of auroral energy flux, has been developed. OVATION-SM is a linear combination of the SME index (or square root of SME index for monoenergetic auroras), time since the last substorm onset, and time until the next substorm onset. Because OVATION-SM is based on ground magnetometer data and products of that data, it is possible to calculate continuous auroral power at a 1 min cadence for 30+ years. OVATION-SM captures the gross auroral morphology, including onsets and other brightening and dimming events. The detailed spatial auroral morphology is beyond the scope of the current version of OVATION-SM. OVATION-SM explains more than 70% of the variance in Polar UV Imager nightside auroral power, which makes it a better predictor of nightside auroral power than any other model currently available. Key Points Developed OVATION-SM, empirical model for different types of auroral energy flux Explains 71% of variance in Polar UVI auroral power, better than any model OVATION-SM captures pre-onset ion precipitation