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Cosmic-ray transport in the heliosphere and in astrospheres

Since the 1970s a fleet of spacecraft has explored and will continue to explore the heliosphere from the inner boundary (e.g. Parker Solar Probe, Solar Orbiter, Helios; see Marquardt et al. 2018, and references therein) to the outer boundary (e.g. Pioneer-10 and 11, Ulysses, Voyager 1 and 2) and in three dimensions (Heber 2013, and references therein). Close to Earth the most sophisticated measurements of cosmic rays are made with the AMS-02. In this work we will undertake a measurement-guided modelling of the cosmic-ray transport in the heliosphere (similar to Ferreira et al 1999). In order to utilize these results for validation for the cosmic-ray transport in an astrosphere, the heliosphere is treated as an astrosphere: i.e. results of hydrodynamic (HD) and magneto-hydrodynamic (MHD) numerical models are utilized to calculate the global structure and the transport parameters (see for example Scherer et al. 2015, and references therein). On top of these results a cosmic-ray transport model is utilized to calculate the particle distribution.
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Research Area: 
Space Physics

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