Thundercloud Configurations Favorable for Radiation Enhancement in Surface Detectors at Aragats

Abstract:  The mountainous terrain of Armenia contributes to thunderstorm formation there. Observations for more than a decade at the high (3200 m MSL) Aragats mountain station have demonstrated the presence of runaway electrons, accelerated downward by the electric field of the storm, to produce so-called Thunderstorm Ground Enhancements. More than 500 cases have been observed from 2012 to 2020.

Cartoon illustrated TGE and TGF initiation above Aragats mountain

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Types of lightning discharges that abruptly terminate enhanced

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The prolonged gamma ray enhancement and the short radiation burst