The role of the chromospheric magnetic canopy in the formation of a sunspot penumbra P. Lindner, C. Kuckein, S. J. González Manrique, N. Bello González, L. Kleint and T. Berkefeld A&A, 673 (2023) A64 Published online: 05 May 2023 DOI: 10.1051/0004-6361/202245702