Experimental Evidence of Giant Electron - Gamma Bursts Generated by   Extensive Atmospheric Showers in Thunderclouds
  The existence of a new phenomena - giant electron-gamma bursts is established. The bursts are generated in thunderclouds as a result of the combined action of runaway breakdown and extensive atmosphere showers (RB-EAS). The experiments were fulfilled at the Tien Shan Mountain Scientific Station using EAS-Radio installation. This specially constructed installation consists of a wide spread EAS trigger array and a high time resolution radiointerferometer. 
A.V.Gurevich, A.N.Karashtin, A.P.Chubenko, L.M.Duncan, V.A.Ryabov,   A.S.Shepetov, V.P.Antonova, S.V.Kryukov, V.V.Piscal, M....