(a)–(b) Coronal magnetic field configuration as seen from Earth on 2014 February 25 at 00:04 UT obtained by (a) the PFSS model and (b) the MAS model. A selection of closed (white) and open (purple) field lines are shown. The black patches on the solar surface (at 1 R_⊙) in panel (b) show the location of coronal holes. (c) Combination of images taken by the SOHO/LASCO/C2 and C3 coronagraphs showing the structure of streamers and the presence of a southwestward directed CME (indicated by the arrow) prior to the occurrence of the SEP event on 2014 February 25.