High-rigidity Forbush decreases: due to CMEs or shocks? K. P. Arunbabu, H. M. Antia, S. R. Dugad, S. K. Gupta, Y. Hayashi, S. Kawakami, P. K. Mohanty, T. Nonaka, A. Oshima and P. Subramanian A&A, 555 (2013) A139 Published online: 12 July 2013 DOI: 10.1051/0004-6361/201220830