Cosmic ray flux at the Earth in a variable heliosphere |
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Authors: | K Scherer H Fichtner B Heber SES Ferreira MS Potgieter |
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Institution: | 1. Institut für Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany;2. Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität Kiel, Leibnitzstra337e 19, 24118 Kiel, Germany;3. Unit for Space Physics, School of Physics, North-West University, 2520 Potchefstroom, South Africa |
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Abstract: | In recent years the variability of the cosmic ray flux has become one of the main issues not only for the interpretation of the abundances of cosmogenic isotopes in cosmochronic archives like, e.g., ice cores, but also for its potential impact on the terrestrial climate. It has been re-emphasized that the cosmic ray flux is not only varying due to the solar activity-induced changes of the solar wind but also in response to the changing state of the interstellar medium surrounding the heliosphere. We demonstrate the significance of these external boundary condition changes along the galactic orbit of the Sun for the flux as well as spectra of cosmic rays. Such interstellar–terrestrial relations are a major topic of the International Heliophysical Year 2007. |
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Keywords: | Variable heliosphere Cosmic ray propagation Interstellar medium |
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