Development of Count Rate Correction for ALPAQUITA Detector Array

The ALPACA experiment is a composite air shower array experiment aiming to observe cosmic rays and gamma rays in TeV to PeV energy range in the Southern Hemisphere. The experiment consists of a 83,000 m2 surface detector array and 3,600 m2 underground water Cherenkov type muon detector in the Chacaltaya plateau (4,740 m a.s.l) in Bolivia. Currently, the prototype experiment is fully operational with a surface detector array covering 18,000 m2 with 97 scintillation detectors each with an area of 1 m2, deployed with 15m spacing. The array operates in two data recording modes: count rate mode (single up to four detector hits) and event reconstruction mode (detection in over three detectors). We successfully observed the Forbush decrease effect in May 2024 using the count rate mode and expect to observe more transient events with extended operation time. In this work, we present a correction method for count rate data using fast Fourier transform analysis on on-site meteorological data to enhance the detection and precise measurement of transient events.