Extreme dominance of Earth-origin heavy ions in the intense ring current near the Earth during the May 2024 super geomagnetic storm. - Kitamura N; Yamamoto K; Yokota S; Kasahara S; Matsuoka A; Asamura K; Ebihara Y; Kistler LM; Keika K; Shinbori A; Hori T; Miyoshi Y; et al. (Science advances, 2026)