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Nuclear explosions conducted near the ground surface but higher than about 5-6 m/kt produce a reverse flow (downward along the symmetry axis) after the shock wave is reflected from the ground. This reverse flow persists until destroyed by the buoyant rise of the fireball on time scales of several seconds-Six calculations of bursts with scaled heights-ofburst ranging upward from 15 m/kt ' are described- The height of the reverse flow is a simple function of the burst height and explosion yield.doi:10.2172/5898202 fatcat:xdebobtytbd6hmfqhdmqlbzopi