THE IONIZATION OF SOLAR COSMIC RAY IN THE IONOSPHERIC D-REGION

Solar cosmic ray which propagates to the ionospheric D-region, especially in the polar cap ionospheric D-region, causes the PCAphenomena. In this paber, the solar cosmic ray ioni-zation formula in D-region is deduced from Bethe-Block formula that are more accurate than the previous treatment. Based on that, the formula of electron production is also obtained, and this computations is made with the solar cosmic ray importance, energy spectrum index, height, latitude taking into account so it is more accurate. The results show that the electron production rate of solar cosmic ray varies with different importances of solar cosmic ray and its energy spectra index. When the importance of solar cosmic ray event is the same (the integration flux is the same), the larger the energy spectra index is, the larger the electron proluction rate at high altitudes (>55km) is; the smaller the energy spectra index is, the larger the electron production rate at low height (>55km) is. The distribution of electron production rate with height have obvious two peaks, one is at 60km that is mainly caused by proton, the other is at 85km that is mainly caused by particles of z≥2.