The MCEq Package: Atmospheric Lepton Flux Modelling

Stefan Fröse^1*, Anatoli Fedynitch¹

¹Institute of Physics, Academia Sinica, Taipei City, Taiwan

* Presenter:Stefan Fröse, email:stefanfroese@as.edu.tw

Estimating atmospheric lepton fluxes plays a crucial role in modern muon tomography, neutrino, and cosmic-ray experiments, where they appear as either signal or background in detector measurements. The MCEq (matrix cascade equations) Python package is capable of calculating these lepton fluxes by modelling the cosmic ray-induced particle cascades in the Earth’s atmosphere through a few thousand coupled partial integro-differential equations. Due to its modular design and intuitive user interface, MCEq gained popularity as the main tool for modelling flux in IceCube, and likewise in various theoretical or phenomenological studies.
In this work, we present the current status of MCEq and discuss recent developments.

Keywords: atmosphere, leptons, icecube, modelling, python