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Comparison of the observed TGF spectrum with the model of P09 and a spectrum typical of relativistic runaway. Data points: spectrum of 289 summed TGFs from RHESSI (Ref. 6). Histogram including narrow line: the model of P09 including the effects of Earth’s atmosphere and the response of the RHESSI instrument. Smooth curve: relativistic runaway bremsstrahlung model at 15 km from Dwyer and Smith (Ref. 6).
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Paiva presented in these pages an argument that terrestrial gamma-ray flashes (TGFs) are created by the interaction of lightning-generated neutrons with nitrogen nuclei in air. I show that this model cannot produce the observed energyspectrum of TGFs, while the generally accepted model of bremsstrahlung from relativistic electrons fits the data well.
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