Solar energetic particle fluxes during October-November 2003 and induced changes in chemical composition of the Earth's atmosphere

Strong manifestation of solar activity processes during the period of October-November 2003 was in the focus of this study. Solar energetic particle fluxes measured from the board of Russian solar observatory "CORONAS-F", the second satellite of CORONAS, which was launched July 31, 2001 and continued till now, have been used in presented study. This satellite has circular orbit with altitude ~ 500 km and inclination ~ 83(T=94.5 min.) Set of instruments was created for energetic neutral emission of solar flares and SEP measurements in SINP MSU. Two semiconductor detectors were used for electrons with energies 0.3-0.6, 0.6-1.5,1.5-3., 3-6 and 6-12 MeV and protons with energies 1-5 MeV detection. Protons with energies 14-26, 26-50 and 50-90 MeV were detected by complex detector. The ionization rates caused by solar protons were calculated to simulate the response of middle atmosphere chemical composition during the period of SPE. It was assumed, that each pair of ions produced by solar protons generate 1.27 molecular of nitrogen oxides and 2.0 molecular of hydrogen oxides. The photochemical model developed in Central Aerological Observatory was used for simulations. The results of simulations showed that only SPE of 28 October 2003 caused real response in ozonosphere of the Earth compared to famous SPE of 14 July 2000. Unfortunately we have not data from UARS (HALOE instrument) to compare the results of simulations with observations. So, we need use ozone data from other satellites.This work was supported by Russian Science Foundation (grant number: 03-05-64675).