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The Dark Matter Particle Explorer (DAMPE) has been undergoing a stableon-orbit operation for more than 6 years and acquired observation of over 11billion events. And a better understanding of the overall radiation environmenton the DAMPE orbit is crucial for both simulation data production and flightdata analysis. In this work, we study the radiation environment at the lowEarth orbit and develop a simulation software package using the framework ofATMNC3, in which state-of-the-art full 3D models of the Earth's atmospheric andmagnetic-field configurations is integrated. We consider in our Monte Carloprocedure event-by-event propagation of the cosmic rays in the geomagneticfield and their interaction with the Earth's atmosphere, focusing on theparticles above GeV that are able to trigger the DAMPE data acquisition system.We compare the simulation results with the cosmic-ray electrons and positrons(CREs) flux measurements made by DAMPE. The overall agreement on both thespectral and angular distribution of the CREs flux demonstrates that oursimulation is well established. Our software package could be of more generalusage for the simulation of the radiation environment at the low Earth orbit ofvarious altitudes.

A Study on Monte Carlo simulation of the radiation environment above GeV at the DAMPE orbit