Randomized trial shows high-latitude current dynamics in Antarctica, suggesting new insights into space weather effects.
We analyze the May 2024 geomagnetic storm using a unique longitudinal chain of Antarctic stations, including the new remote Talos Dome measurement site. By combining its high‐resolution magnetic data with observed values from coastal (Terra Nova Bay and Scott Base) and the polar‐cap (Dome C) observatories, Southern Hemisphere auroral indices, and field‐aligned currents, we examine high‐latitude current systems and ultra‐low frequency wave activity. The storm drove a clear magnetic local time‐dependent H component variation at Talos Dome, characteristic of polar cap convection. The observation of coherent magnetic bays simultaneously along 80°S magnetic latitude during substorms provides evidence that intense lower‐latitude electrojet activity modulates polar cap currents. Sustained ultra‐low frequency wave power below 1 mHz was enhanced across the network. The study demonstrates Talos Dome's reliability and provides new insights into polar cap electrodynamics during extreme space weather conditions.
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Santarelli et al. (2026) studied this question.
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