Left: Synthesized light curves. The solid and dashed lines are the light curves of the thick Al and Be filters, respectively. They must be multiplied by ﹩3.2\times 10^{16}﹩ to obtain the value in DN s⁻¹ pixel⁻¹ for the full resolution image. Right: Temporal variation of e_th, the thermal energy per unit area derived by the SXT filter ratio method. The solid line is the least‐squares fitting of the impulsive phase.