Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 33: Cosmic Rays VI

T 33.2: Vortrag

Dienstag, 16. März 2021, 16:15–16:30, Th

Studying the Energy-Dependent Cosmic-Ray Moon and Sun Shadow with IceCube Data. — •Johan Wulff, Frederik Tenholt, and Julia Tjus for the IceCube collaboration — Ruhr-Universität Bochum

Measuring the temporal variation of the Cosmic-Ray Sun shadow has proven to be a useful tool for assessing solar magnetic field models.

By comparing seven years of IceCube data with the Solar Cycle and magnetic field models, the relationship between the solar activity and the strength of the Cosmic-Ray Sun shadow was investigated in a recent publication (Aartsen et al, accepted for Publication in PRD). Furthermore, two different models of the coronal magnetic field were tested by modelling cosmic-ray propagation in the solar magnetic field and comparing the predicted Sun shadow to the measured one.

In this work, an event-based energy reconstruction was introduced in the analysis of the 7-year data set. This allows for an investigation of the energy dependence of both shadows. Furhtermore, magnetic field effects of the Sun shadow can be investigated at different energies and an energy-dependent pointing can be studied with the Cosmic-Ray Moon shadow.

In this talk, various approaches at an event-based energy reconstruction using machine-learning techniques will be discussed with respect to their performance on the IceCube Cosmic-Ray Moon and Sun shadow data.