München 2019 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 4: Sun and Heliosphere II

EP 4.1: Vortrag

Mittwoch, 20. März 2019, 11:30–11:45, HS 19

Realistic solar modulation of cosmic rays in a semi-analytical framework — •Marco Kuhlen and Philipp Mertsch — Institute for Theoretical Particle Physics and Cosmology (TTK), RWTH Aachen University, Germany

When galactic cosmic rays enter the heliosphere they encounter the solar wind with its frozen-in magnetic field, which can modulate the cosmic ray flux in the heliosphere up to energies as high as 50 GeV. This problem is oftentimes treated in the simple force field approximation that characterises the modulation effects in a single parameter. However, this simplicity is at the cost of reducing the dimensionality of the problem and ignoring important transport processes like drifts in the inhomogeneous large-scale field. Predictions from force-field models are also in tension with recent time-dependent data from experiments like PAMELA and AMS-02. In this work, we present a new and straightforward extension to the force field model that takes into account charge sign dependent modulation due to drifts in the heliospheric magnetic field. We compare our semi-analytical results both to time-dependent data and to a numerical solution of the full transport equation and find good agreement.

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