Solar modulation of cosmic rays in a semi-analytical framework
July 22, 2019
When Galactic cosmic rays enter the heliosphere they encounter the solar wind with its frozen-in
magnetic field, which modulates the cosmic ray flux in the heliosphere up to rigidities as high as
40 GeV. 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 start by validating our semi-analytical approach via a comparison to a fully numerical
model. Our model nicely reproduces the AMS-02 measurements and we find the strength of
diffusion and drifts to be strongly correlated with the heliospheric tilt angle and magnitude of the
magnetic field. We are able to predict the electron and positron fluxes beyond the range for which
measurements by AMS-02 have been presented.
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