A physical approach to modelling large-scale galactic magnetic fields Anvar Shukurov, Luiz Felippe S. Rodrigues, Paul J. Bushby, James Hollins and Jörg P. Rachen A&A, 623 (2019) A113 Published online: 13 March 2019 DOI: 10.1051/0004-6361/201834642