Fig. 1. The simulated shape of debris at different time (a) H=40 km, Q=100 kt, (b) H=80 km, Q=4 Mt

Fig. 2. Diagram of the delayed γ-ray source from the spheroidicity debris (a) and inverted pear-shaped debris (b)

Fig. 3. Geometry model of the transport of delayed γ-rays from single layer debris in the atmosphere

Fig. 4. Varistions of γ-fluence and energy fluence of delayed γ-rays with height

Fig. 5. Electron production rate caused by the debris in different layer after 5 min of the explosion with the equivalent of 4 Mt at the height of 80 km (a) 1st layer debris, (b) 4th layer debris, (c) 7th layer debris, (d) 10th layer debris

Fig. 6. Electron production rate caused by delayed γ-rays after 5 min (a) and 20 min (b) of the explosion with the equivalent of 4 Mt at the height of 80 km

Fig. 7. Electron production rate caused by delayed γ-rays after 5 min (a) and 20 min (b) of the explosion with the equivalent of 4 Mt at the height of 40 km

Fig. 8. Electron production rate caused by delayed γ-rays after 5 min (a) and 20 min (b) of the explosion with the equivalent of 100 kt at the height of 80 km

Fig. 9. Electron production rate caused by delayed γ-rays after 5 min (a) and 20 min (b) of the explosion with the equivalent of 100 kt at the height of 40 km

Fig. 10. Electron density caused by delayed γ-rays after 5 min (a) and 20 min (b) of the explosion with the equivalent of 4 Mt at the height of 80 km