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At recent one of the modern topics in solar-terrestrial phys ics is the study of the possible effect of solar variability, respectively cosmic rays variation o atmospheric physics and chemistry. An important feature in most of the proposed mechanisms and m o els is the key role of the induced by cosmic rays ionization. At recent is observed an a pparent effect on minor constituents and aerosols over polar regions during major solar proton ev ents. Therefore the ground level enhancement 70 on 13 December 2006 deserves a special attent ion. I this work we compute the ion production on 13 December 2006 on the basis on a previo usly applied model based on detailed Monte Carlo simulations of cosmic ray induced atmo spheric cascade. The ion production rate during the event is considered as superposition of cosm i rays with galactic and solar origin. The time evolution of ion production is computed in a realist ic manner. The spectral and angular characteristics of the solar protons are explicitly consid ere throughout the event as well their time evolution. The ionization effect during the event is co mputed at several altitudes above the sea level in a region withRc ≤ 1 GV. The 24h ionization effect is estimated in the region of the Pfotzer maximum.

Computation of ionization effect due to cosmic rays in polar middle atmosphere during GLE 70 on 13 December 2006