Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 19: Various topics in astroparticle physics

T 19.2: Talk

Monday, March 30, 2020, 16:45–17:00, L-3.002

Time-Dependent AMS-02 Electron-Positron Fluxes in an Extended Force-Field Model — •Marco Kuhlen and Philipp Mertsch — Institute for Theoretical Particle Physics and Cosmology (TTK), RWTH Aachen University, Aachen, Germany

The magnetized solar wind modulates the Galactic cosmic ray flux in the heliosphere up to rigidities as high as 40 GeV. We present a new and straightforward extension of the popular but limited force-field model, thus providing a fast and robust method for phenomenological studies of Galactic cosmic rays. Our semianalytical approach takes into account charge-sign dependent modulation due to drifts in the heliospheric magnetic field and has been validated via comparison to a fully numerical code. Our model nicely reproduces the time-dependent 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. We have made an example script for the semianalytical model publicly available and we urge the community to adopt this approach for phenomenological studies.