Two-point observations of low-frequency waves at 67P/Churyumov-Gerasimenko during descent of PHILAE: Comparison of RPCMAG and ROMAP - Richter, I; Auster, H-U; Berghofer, G; Carr, CM; Cupido, E; Fornacon, K-H; Goetz, C; Heinisch, P; Koenders, C; Stoll, B; Tsurutani, BT; Vallat, C; et al. (Annales Geophysicae, 2016)