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The possible effect of solar variability, accordingly cosmic rays variationon atmospheric physics and chemistry is highly debated over the last years.According to several recent models the induced by cosmic rays atmosphericionization plays a key role in several different processes. At recent, anapparent effect on minor constituents and aerosols over polar regions duringmajor solar proton events was observed. The ion production rate during groundlevel enhancements is a superposition of the contribution of cosmic rays withgalactic and solar origin. The solar cycle 23 provided several strong groundlevel enhancements. The period of end October - beginning of November 2003 wascharacterized by a strong cosmic ray variability, namely a sequence of threeGLEs was observed. In addition, there were several Forbush decreases, which ledto a suppression of galactic cosmic ray flux. As a consequence the cosmic rayinduced ion production in the atmosphere and the corresponding ionizationeffect were subject of dynamical changes. Here we compute the complex ionproduction due to cosmic rays during the Halloween sequence of ground levelenhancements on October-November 2003 and we estimate the ionization effect.The spectral and angular characteristics of the solar protons are explicitlyconsidered throughout the events as well their time evolution. The ionizationeffect during the period is computed at several altitudes above the sea levelin a region with $R_{c}$ $\le$ 1 GV and $R_{c}$ $\le$ 2 GV.

Computation of complex ion production due to cosmic rays during the Halloween sequence of GLEs on October-November 2003