Upstream solar wind speed at comet 67P - Reconstruction method, model comparison, and results H. Nilsson, A. Moeslinger, H. N. Williamson, S. Bergman, H. Gunell, G. Stenberg Wieser, Y. Futaana, T. Karlsson, E. Behar and M. Holmström A&A, 659 (2022) A18 Published online: 28 February 2022 DOI: 10.1051/0004-6361/202142867