Centroids of moving radio sources through time and associated solar activity visible from three perspectives. Panel a: centroids of the three moving sources identified in Fig. 1, overlaid on an SDO/AIA 211 Å image of the Sun at 13:45 UT. The centroids are colour-coded through time from 13:28 until 14:06 UT. In the AIA image, the source active region appears bright as a result of the sudden energy release of the M-class flare, however the accompanying CME is not visible. Panel b: solar activity as viewed from the STEREO-B perspective that captures a side view of the flare and associated CME from the eastern side with respect to the SDO field of view at 13:45 UT. Panel c: solar activity as viewed from the STEREO-A perspective that captures a side view of the flare and associated CME from the western side with respect to the SDO field of view at 13:45 UT. The EUV images at 195 Å from EUVI are combined with coronograph images from the COR1 cameras onboard both STEREO-A and -B. The locations of SDO, STEREO-A, and STEREO-B in the ecliptic plane relative to the Sun can be seen in the insert in panel a.