Optical signatures of field line resonances: comprehensive survey and precipitation mechanisms

Field line resonances (FLRs) are a unique phenomenon linking MHD waves in the magnetosphere to signatures on the Earth's surface. The generation mechanisms of FLRS have been extensively studied, however little is known about the role of FLRs in generating auroral precipitation. Recent advances in ground-based auroral imaging and the newly operational Redline Emission Geospace Observatory (REGO) imagers has produced a unique dataset for elucidating the connection between FLRs and discrete aurora arcs. In this study, we present the first extensive survey of optical auroral signatures of FLRs. Utilizing REGO imager data from 2014 to 2016, we catalogued over 220 FLR events. We present results from the comprehensive analysis of morphology, frequency, occurrence rate, and motion of the optical signatures. We also place these results in context with relevant arc generation theories and suggest a mechanism for FLR related precipitation.