The shape and evolution of the energy spectra of the
thunderstorm ground enhancement (TGE) electrons and gamma rays shed
light on the origin of TGEs, on the relationship between
modification of the cosmic ray electron energy spectra (MOS) and
relativistic runaway electron avalanche (RREA) processes, on the
energy of the seed electrons, and on the strength and elongation of
an atmospheric electric field. The network of large NaI
spectrometers on slopes of Mt. Aragats 24/7 monitored secondary
particle fluxes from 2013 until now, highly contributed to the
understanding of the ways how RREAs are developed in the
atmosphere. In 2022 we enlarge the NaI network with 2 remote
detectors located at altitudes 2000 and 1700 m, and 13 and 16 km
apart from the Aragats station to investigate the horizontal profile
of the atmospheric electric field. We found, that the previously
estimated values of the regions in the atmosphere, where RREA
emerges, were highly underestimated. In the present report, we
describe the NaI particle detector's network and present the first
results of the experiment demonstrating that the particle fluxes
from the atmospheric electron accelerators can cover large areas on
the earth's (up to tens of km2).