Characterising fast-time variations in the hard X-ray time profiles of solar flares using Solar Orbiter’s STIX

Solar Orbiter First Results (Nominal Mission Phase)

Open Access

Fig. 2.

Overview of the SOL2021-09-23 flare. The 18−28 keV HXR non-thermal Gaussian decomposition is shown with a standard deviation of the residual σ_R = 1.83. The first few peaks have substructure on timescales smoothed out in the GP regression output. As a result, variations on these timescales are not well fit.

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