Structure of a collisionless pair jet in a magnetized electron–proton plasma: flow-aligned magnetic fieldM. E. Dieckmann, D. Folini, I. Hotz, A. Nordman, P. Dell’Acqua, A. Ynnerman and R. WalderA&A, 621 (2019) A142DOI: https://doi.org/10.1051/0004-6361/201834393