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The collisional thick target model, wherein a large number of electrons areaccelerated down a flaring loop, can be used to explain many observedproperties of solar flares. In this study, we focus on the sensitivity of GOESflare classification to the properties of the thick target model. Using ahydrodynamic model with RHESSI-derived electron beam parameters, we explore theeffects of the beam energy flux (or total non-thermal energy), the cut-offenergy, and the spectral index of the electron distribution on the soft X-rays(SXRs) observed by GOES. We conclude that (1) the GOES class is proportional tothe non-thermal energy $E^{\alpha}$ for $\alpha \approx 1.7$ in the low energypassband (1-8 \AA) and $\approx 1.6$ in the high energy passband (0.5-4 \AA);(2) the GOES class is only weakly dependent on the spectral index in bothpassbands; (3) increases in the cut-off will increase the flux in the 0.5-4\AA\ passband, but decrease the flux in the 1-8 \AA\ passband, while decreasesin the cut-off will cause a decrease in the 0.5-4 \AA\ passband and a slightincrease in the 1-8 \AA\ passband.

On the sensitivity of the GOES flare classification to properties of the electron beam in the thick target model