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Neutron spectrometers are operated simultaneously in the framework of a remoted network. The CHINSTRAP, supported by IPEV, aims at recording neutron spectra at the Concordia station (+3233m) in Antarctica since December 2105. The neutron spectrometer measures the neutron spectrum over a wide energy range from meV up to tens of GeV with a short time resolution. Several parameters can influence the measurement: the atmospheric pressure, the hydrometric environment close to the instrument (snowfall) and the atmospheric water vapor. The atmospheric water vapor dominates the ground cosmic ray variations within the first few hundred meters above the ground. The HAMSTRAD polar project is dedicated to measure of the trends in water vapor and temperature profiles from the lower part of the troposphere to the lower part of the stratosphere, using a radiometer. This paper proposes to present data analyses, including short and long-term analyses (first four years) and taking into account environmental and systematic effects. In particular, study focusing on Forbush Decreases and Ground Level Enhancement occurred in September 2017 is proposed.

proceedings of 36th international cosmic ray conference — pos(icrc2019)

Four Years of Measurements of the Energy Spectrum of Cosmic-Ray-induced-neutrons on the Concordia Antarctic Station Taking into Account Environmental and Systematic Effects