Figure 2. A pattern of the progress of the storm on Aragats on 24 May. ) The distance to the cloud base. b) Images of the graupel fall. c) Disturbances of the NS electric field (blue), count rate of ASNT spectrometer (black), and distance to lightning (red).
On 25 May during a 1-hour long storm, no nearby lightning flashes were registered at all. TGE was lengthy, its duration was ≈18 minutes and particle flux continued both during positive and negative NS electric field, demonstrating that both main scenarios of TGE initiation (with and without emerging LPCR) can be rather smoothly continued during field reversal in the lower part of the cloud. Cloud base was higher than that on 24 May and graupel fall was intense.