Journal ArticleUnexpected STEVE Observations at High Latitude During Quiet Geomagnetic ConditionsGallardo‐Lacourt, B [Department of Physics The Catholic University of America Washington DC USA] (ORCID:0000000336907547); Nishimura, Y [Department of Electrical and Computer Engineering and Center for Space Physics Boston University Boston MA USA] (ORCID:0000000331264394); Kepko, L [Goddard Space Flight Center National Aeronautics and Space Administration Greenbelt MD USA] (ORCID:0000000249118208); Spanswick, E L [Department of Physics and Astronomy University of Calgary Calgary AB Canada] (ORCID:0000000180035091); Gillies, D M [Department of Chemistry and Physics Mount Royal University Calgary AB Canada] (ORCID:000000019608797X); Knudsen, D J [Department of Physics and Astronomy University of Calgary Calgary AB Canada] (ORCID:0000000158982260); Burchill, J K [Department of Physics and Astronomy University of Calgary Calgary AB Canada] (ORCID:0000000283640307); Skone, S H [Department of Geomatics Engineering University of Calgary Calgary AB Canada]; Pinto, V A [Center for Interdisciplinary Research in Astrophysics and Space Sciences (CIRAS) Universidad de Santiago de Chile Santiago Chile] (ORCID:000000031210167X); Chaddock, D [Department of Physics and Astronomy University of Calgary Calgary AB Canada] (ORCID:0009000894811184); Kuzub, J [Citizen Scientist Jufa Intermedia Ottawa ON Canada] (ORCID:0000000292943668); Donovan, E F [Department of Physics and Astronomy University of Calgary Calgary AB Canada] (ORCID:0000000285574155)<title>Abstract</title> <p>Strong Thermal Emission Velocity Enhancement (STEVE), is a captivating optical phenomenon typically observed in the mid‐latitude ionosphere. This paper presents an intriguing observation of a STEVE event at high‐latitudes, approximately 10 degrees poleward of previously documented observations. This event was recorded in Yellowknife, Canada, by a TREx RGB imager and a citizen scientist. Swarm satellites traversed the latitude of the observation, measuring extreme westwards ion drift velocities exceeding 4 km/s. Such velocities are more typically associated with the subauroral region located at mid‐latitudes, rather than at the high‐latitudes reported here. Significantly, this event occurred without a substorm, which differs from previous STEVE observations. While high‐latitude radars detected fast ionospheric equatorward flows, GOES satellite did not record any injections. These observations suggest that the inner magnetosphere is highly inflated. This unique case study raises new questions surrounding subauroral dynamics and the influence of magnetospheric configurations on ionospheric responses.</p>Wiley2024-10-1610674365Geophysical Research Letters51190094-8276https://doi.org/10.1029/2024GL1105682445467National Science Foundation