Time-dependent transport of energetic particles in the atmosphere, magnetosphere and heliosphere, reconstruction of the long-term flux heliospheric environment, atmospheric ionisation, production of neutrons and cosmogenic isotopes

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Based on the progress we made during the second phase of the DFG-priority programm CAWSES and on the advance in the general understanding of the significance of energetic charged particles for the terrestrial atmosphere has been made during recent years, we will proceed with the CAWSES-project 'Heliocauses' to compute the cosmic ray flux variations over extended time periods. This will be the first reconstruction of the cosmic ray flux within the framework of a hybrid model. The latter takes self-consistently into account the transport of energetic particles in a dynamical heliosphere that is interacting with the interstellar environment and will be improved in view of the recent Voyager observations in the heliosheath. The cosmic ray flux reconstruction will be available in terms of energy spectra at the Earth orbit and serve as an input to our modelling of the interaction of cosmic rays with the terrestrial atmosphere. The result of the latter, besides ionisation profiles and neutron production rates, will be a time series of the estimated cosmogenic isotope production to be compared with data naturally archived in ice cores. A new aspect of our research will be the additional validation of our modelling by the use of the CAWSES-re lated EISCAT facility to obtain measurements of the atmospheric ionisation. This way the goal of 'Heliocauses' will be reached, namely to determine the heliospheric influences on the climate and weather of the Sun-Earth system.