Observations of the helium focusing cone with pickup ions G. Gloeckler, E. Möbius, J. Geiss, M. Bzowski, S. Chalov, H. Fahr, D. R. McMullin, H. Noda, M. Oka, D. Ruciński et al. (5 more) A&A, 426 3 (2004) 845-854 Published online: 18 October 2004 DOI: 10.1051/0004-6361:20035768