Temporal evolution of the mean Hα intensity (dashed line with triangle symbols) in the region of the flare as obtained from ChroTel, and the GOES 15 X-ray flux in the 0.1–0.8 nm energy channel (solid line). A small C2.9 flare occurred at 10:37 UT, which is immediately followed by the M5.6 flare at 10:52 UT.
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