Cosmic rays in the dynamic heliosheath |
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Authors: | SES Ferreira K Scherer MS Potgieter |
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Institution: | 1. Unit for Space Physics, School of Physics, North-West University, 2520 Potchefstroom, South Africa;2. Institut für Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany |
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Abstract: | Cosmic ray modulation in the outer heliosphere is discussed from a modeling perspective. Emphasis is on the transport and acceleration of these particles at and beyond the solar wind termination shock in the inner heliosheath region and how this changes over a solar cycle. We will show that by using numerical models, and by comparing results to spacecraft observations, much can be learned about the dependence of cosmic ray modulation on solar cycle changes in the solar wind and heliospheric magnetic field. While the first determines the heliospheric geometry and shock structure, the latter results in a time-dependence of the transport coefficients. Depending on energy, both these effects contribute to cosmic ray intensities in the inner heliosheath changing over a solar cycle. |
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Keywords: | Heliosphere Cosmic rays Inner heliosheath Modulation Termination shock |
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