Seasonal Variations of the Atmospheric Muon Neutrino Spectrum measured with IceCube

This study presents an energy-dependent analysis of seasonal variations in the atmospheric muon neutrino spectrum, using 11. 3 years of data from the IceCube Neutrino Observatory. By leveraging a novel spectral unfolding method, we explore the energy range from 125 GeV to 10 TeV for zenith angles between 90 to 110, corresponding to the Antarctic atmosphere. Our findings reveal that the seasonal variation amplitude decreases with energy reaching (-4. 6 1. 1) \% during Austral winter and increases (+3. 9 1. 2) \% during Austral summer relative to the annual average at 10TeV. While the unfolded flux exceeds the model predictions by up to 30\%, the differential measurement of seasonal variations remains unaffected. The measured seasonal variations of the muon neutrino spectrum are consistent with theoretical predictions using the MCEq code and the NRLMSISE-00 atmospheric model.