Study of shock waves interacting with Ar and N2 low pressure dc discharges G. Cicala, D. Bruno, M. Capitelli, S. Longo and A. C. Rainò Eur. Phys. J. D, 57 3 (2010) 375-385 Published online: 16 March 2010 DOI: 10.1140/epjd/e2010-00066-y