Measurement of helium flux and variability in low earth orbit with the Alpha Magnetic Spectrometer

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2022-2

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Karagöz, Gülce

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The Alpha Magnetic Spectrometer (AMS-02) is an unrivalled particle physics detec- tor with a large magnet whose aim is to search for anti-matter and dark matter by performing measurements on cosmic ray composition and flux. AMS-02 has been operating on the International Space Station (ISS) since its launch on the 16th May 2011, and is planned to operate along the lifetime of the ISS. AMS-02 has a unique design with a large acceptance and sensitive detection of cosmic rays, allowing one to better understand the acceleration and origin of cosmic rays. Helium nuclei are the second most abundant nuclei in the cosmic ray composition and since Helium has the smallest cross-section among the cosmic ray nuclei, it interacts the least with the interstellar medium, which means that the helium nuclei can travel from the furthest points of the galaxy. In this work, helium nuclei spectrum is studied in two parts. The first one is the time-independent helium flux, in which the flux is investigated in a large energy range up to 1.2TV. The second is the time-dependent helium flux, where the flux is investigated in a smaller energy scale in which our Sun dominates with its contribution.

Subject Keywords

AMS-02, Helium flux, Cosmic ray, Solar modulation

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https://hdl.handle.net/11511/96377

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

G. Karagöz, “Measurement of helium flux and variability in low earth orbit with the Alpha Magnetic Spectrometer,” M.S. - Master of Science, Middle East Technical University, 2022.