Solar coronal conditions between 2005 September 7 and 18, including SEP event I20/R13. (a) 20-minute running averages of the INTEGRAL/SREM particle flux timeseries, (b) 20-minute running averages of the Rosetta/SREM particle flux timeseries, (c) GOES 1–8 Å solar X-ray flux and (d) WIND/WAVES frequency-time radio spectrum. The vertical solid black line indicates the onset time of the flare related to the SEP events source eruption. The flare information is annotated in (c) and the source CME information is annotated in (d). The dashed black line at 23:02 on September 13 indicates the SEP event onset time observed first by the lowest energy channel but simultaneously for both INTEGRAL/SREM and Rosetta/SREM. The colors used in (a) and (b) correspond to the different energy channels of the SREM detectors.