Atmospheric effects on cosmic-ray muon rate at high latitude (78.9°N)

Since 2019, three scintillator detectors of the EEE collaboration have been continuously measuring cosmic muon rates at 78.9°N at the Ny-Ålesund Research Station (Svalbard). The resulting six-year time series reveals a pronounced annual modulation, driven primarily by seasonal atmospheric variations. Utilizing routine radiosonde profiles collected above the same site, we applied several established techniques—along with a tailored analysis approach—to investigate the relationship between muon rate and atmospheric temperature. The temperature-corrected muon rates are analyzed using the Lomb–Scargle periodogram technique in order to investigate the presence of remaining periodic structures. Finally, the temperature corrections coefficients of our analysis are compared with measurements in other stations located at lower latitudes.