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We report the first observation of 3$-$30 MeV prolonged gamma-ray emissionthat was abruptly terminated by lightning. The gamma-ray detection was madeduring winter thunderstorms on December 30, 2010 by the Gamma-Ray Observationof Winter THunderclouds (GROWTH) experiment carried out in a coastal area alongthe Sea of Japan. The gamma-ray flux lasted for less than 3 min, continuouslyhardening closer to the lightning occurrence. The hardening at energies of3$-$10 MeV energies was most prominent. The gamma-ray flux abruptly ceased lessthan 800 ms before the lightning flash that occurred over 5 km away from theexperimental site. In addition, we observed a clear difference in the durationof the 3$-$10 MeV gamma rays and those $>$10 MeV, suggesting that the area of$>$10 MeV gamma-ray emission is considerably smaller than that of thelower-energy gamma rays. This work may give a manifestation that a local regionemitting prolonged gamma rays connects with a distant region to initiatelightning.

Hardening and termination of long-duration gamma rays detected prior to lightning