Flux measured by the AIA 1600 Å filter. In the left panel the whole Sun is shown, and the right panel gives a close up around the flare location. The boxes in the right panel show the field of view of the instruments Hinode/EIS (yellow), Hinode/XRT (red), and IRIS (blue) for the SOL2021-09-23UT15:28 flare. STIX observes the whole solar disk from the viewing angle of Solar Orbiter (at an angle of about 33° to the east).