Using Parker Solar Probe observations during the first four perihelia to constrain global magnetohydrodynamic modelsPete Riley, Roberto Lionello, Ronald M. Caplan, Cooper Downs, Jon A. Linker, Samuel T. Badman and Michael L. StevensA&A, 650 (2021) A19DOI: https://doi.org/10.1051/0004-6361/202039815