Observations of umbral flashes in the resonant sunspot chromosphere T. Felipe, S. J. González Manrique, D. Martínez-Gómez, M. M. Gómez-Míguez, E. Khomenko, C. Quintero Noda and H. Socas-Navarro A&A, 693 (2025) A165 Published online: 14 January 2025 DOI: 10.1051/0004-6361/202452317