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The galactic cosmic rays are the main source of ionization in the Earthstratosphere and troposphere. The induced by primary cosmic ray particlesionization is important in various processes related to atmospheric physics andchemistry, specifically the minor constituents. The ion production in theatmosphere is enhanced compared to the average following major solar energeticparticles events, specifically over the polar caps. During the solar cycle 23we observed several strong ground level enhancements, one of the strongestamong them been the Bastille day event on 14 July 2000. In the work presentedhere we apply a full Monte Carlo 3-D model in order to compute the cosmic rayinduced ionization. The model is based on atmospheric shower simulation withthe PLANETOCOSMICS code and the ion production rate is considered as asuperposition of cosmic rays with galactic and solar origin. The ion productionrate is computed as a function of the altitude above the sea level and theshort, mid and long term ionization effect relative to the average due togalactic cosmic rays is computed.

Computation of ion production rate and short, mid and long term ionization effect by cosmic rays during Bastille day event