Greifswald 2024 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 6: Postersession

EP 6.7: Poster

Mittwoch, 28. Februar 2024, 16:30–18:30, ELP 6: Foyer

Detection of protons and helium >50 MeV/nuc on Chandra/EPHIN — •Janna Martens — Christian-Albrechts-Universität zu Kiel

This study presents an in-depth examination of cosmic rays, focusing on protons and helium nuclei, utilizing data from the Electron Proton Helium INstrument (EPHIN) aboard the Chandra X-ray Observatory. The research delves into the energy spectra of these particles, paying particular attention to the influence of solar modulation on their behavior.

The analysis process includes various techniques employed to enhance data resolution. The study also addresses the challenges encountered, such as interference from satellite transits through Earth's radiation belts and issues related to instrument malfunctions, which significantly impact the volume of data suitable for analysis.

In exploring the energy spectra of cosmic rays, the study critically evaluates the force field approach, a prevalent method in cosmic ray propagation research, discussing its limitations. Additionally, the cosmic ray spectrum for the year 2005 is computed, and the integral channel of Chandra/EPHIN is analyzed. This serves as a bridge between its channels for stopping particles and the data collected by the Payload for Antimatter Matter Exploration and Light nuclei Astrophysics detector (PAMELA).

The findings of this research offer valuable insights into the nature of cosmic rays and the functionality of EPHIN, laying a solid foundation for future investigations in this domain.

Keywords: Cosmic rays; EPHIN; Chandra X-ray Observatory; Force field approach