Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 46: Neutrino Astronomy 2

T 46.4: Vortrag

Dienstag, 22. März 2022, 17:00–17:15, T-H31

Studying the Energy Dependent Cosmic Ray Moon and Sun Shadow with IceCube Data. — •Johan Wulff and Julia Becker Tjus for the IceCube collaboration — Institute for theoretical physics IV, Ruhr-University Bochum, Germany

While the Cosmic Ray Moon shadow can be utilised to verify the pointing of detectors such as IceCube, the Sun shadow has proven to be a successful tool for the assessment of solar magnetic field models.

In a previous publication (Aartsen et al, Phys. Rev. D), the relationship between the solar activity and the strength of the Cosmic Ray Sun shadow was investigated by comparing seven years of IceCube data with the solar cycle and solar magnetic field models. By modelling the propagation of Cosmic Rays through the solar magnetic field, two models of the coronal magnetic field were tested by comparing the observed shadow to the predicted one.

For this analysis, an energy reconstruction of Cosmic Ray induced muon events was introduced, allowing for an investigation of the energy dependence of both shadows. Furthermore, 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, the performance of the machine-learning based energy reconstruction with respect to the IceCube Cosmic Ray Sun and Moon shadow dataset, as well as the extension of the Cosmic Ray Sun shadow analysis up to the minimum of the 24th Solar cycle will be discussed. This project is funded via BMBF Verbundforschung, Project 05A20PC2.