Anisotropy of the He+, C+, N+, O+, and Ne+ pickup ion velocity distribution functions C. Drews, L. Berger, A. Taut and R. F. Wimmer-Schweingruber A&A, 588 (2016) A12 Published online: 10 March 2016 DOI: 10.1051/0004-6361/201527603