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End of Storm Oscillation and Thunderstorm Ground Enhancement
  • Ashot A. Chilingarian,
  • Gagik Hovsepyan
Ashot A. Chilingarian
Yerevan Physics Institute

Corresponding Author:[email protected]

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Gagik Hovsepyan
Yerevan Physics Institute
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Abstract

During the abrupt changes of the near-surface (NS) field according to the end of storm oscillations (EOSO) scenario, we observe prolonged thunderstorm ground enhancements (TGE). The EOSO starts with the reduction of the lower positively charged region (LPCR) with the following falling of the near-surface (NS) electric field in the deep negative domain for ≈12 minutes. During these minutes we observe prolonged TGE and graupel fall. Afterward, the NS field returns again to a positive value, although smaller than the initial one. Finally, the field returns to fair-weather conditions. Thus, the ending phase of the storm is followed by the degradation of all 3 charged layers of a tripole.