Fig. 8.

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Time of each peak from the Gaussian decomposition against peak number for the SOL2021-09-23 and SOL2021-10-09 flare shown in Figs. 2 and 3, respectively. The fit gives an estimate of periodicity in the SOL2021-09-23 non-thermal HXR flare signal of ∼19 s. For the SOL2021-10-09 flare, a periodicity of ∼128 s is derived.

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