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A new model CRAC:EPII (Cosmic Ray Atmospheric Cascade: Electron PrecipitationInduced Ionization) is presented. The CRAC:EPII is based on Monte Carlosimulation of precipitating electrons propagation and interaction with matterin the Earth atmosphere. It explicitly considers energy deposit: ionization,pair production, Compton scattering, generation of Bremsstrahlung high energyphotons, photo-ionization and annihilation of positrons, multiple scattering asphysical processes accordingly. The propagation of precipitating electrons andtheir interactions with atmospheric molecules is carried out with the GEANT4simulation tool PLANETOCOSMICS code using NRLMSISE 00 atmospheric model. Theionization yields is compared with an analytical parametrization for variousenergies of incident precipitating electron, using a flux of mono-energeticparticles. A good agreement between the two models is achieved. Subsequently,on the basis of balloon-born measured spectra of precipitating electrons at30.10.2002 and 07.01.2004, the ion production rate in the middle and upperatmosphere is estimated using the CRAC:EPII model

Atmospheric ionization induced by precipitating electrons: Comparison of CRAC:EPII model with parametrization model