Ionization processes in the atmosphere of Titan - III. Ionization by high-Z nuclei cosmic rays G. Gronoff, C. Mertens, J. Lilensten, L. Desorgher, E. Flückiger and P. Velinov A&A, 529 (2011) A143 Published online: 21 April 2011 DOI: 10.1051/0004-6361/201015675