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This paper is an overview of the author's PhD thesis results. ARGO-YBJ is anextensive air shower detector located at Yangbajing (Tibet, China) at 4300 ma.s.l. It is made by a full coverage carpet plus a guard ring (total surfaceabout 6700 m^2) of Resistive Plate Chambers grouped into 153 units calledclusters. The experiment has two different operation modes. The former, thescaler mode, counts the number of events with particle multiplicity >=1, >=2,>=3, >=4 allowing to reach the lowest energy threshold of the detector (fewGeVs). The latter, the shower mode, measures coordinates and arrival time ofeach particle hitting the carpet for a complete shower reconstruction at anenergy threshold of few hundreds of GeVs. Due to the high sensitivity of scalermode it becomes very important remove all environmental parameter effects fromscaler counts. The careful study of cosmic ray variations with environmentalvariables (such as atmospheric pressure, temperature, local radioactivity)allowed the correct estimation of the significance of signals registered inscaler mode. Episodes of counting rate variations both in scaler and showermode in correspondence to high electric field variations are discussed,together with the study of temporal and spatial characteristics of cosmic rayshowers during thunderstorms.

Study of the Influence of High Electric Field Variations on Cosmic Ray Flux detected by the ARGO-YBJ Experiment