Hard X-ray spectra. RHESSI X-ray spectra derived during nine selected time intervals during the impulsive phase of the HXR emission together with the applied fits. The spectra are fitted with an isothermal model (dashed-dotted line) and a functional power law with a turnover at low energies (dashed line). The gray solid line indicates the sum of the two components. The spectrum during the early impulsive phase (panels a) and b)) was fitted in the energy range 6–40 keV, while the other spectra (panels c)–i)) are fitted in the range 6–100 keV.
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