The role of aerodynamic drag in propagation of interplanetary coronal mass ejections B. Vršnak, T. Žic, T. V. Falkenberg, C. Möstl, S. Vennerstrom and D. Vrbanec A&A, 512 (2010) A43 Published online: 26 March 2010 DOI: 10.1051/0004-6361/200913482