Measurements of the trapped proton and helium fluxes in the PAMELA experiment
August 18, 2023
A new processing of the data obtained with the PAMELA spectrometer in the under-cutoff area and particularly at the lower edge of the Earth’s Inner Radiation Belt (IRB) is presented. For the reconstruction of anisotropic fluxes, a new method has been developed. The method is based on the division of the instrument’s field of view (FOV) into segments within which the flux could be treated as isotropic. For such an approach one single simulation data set is required. Using this method, distributions of proton fluxes measured with the PAMELA spectrometer over equatorial pitch angle, L-shell, and energy were reconstructed in a new way. Additionally, high energy (E>50 MeV/n) trapped 3He nuclei were found and analyzed.
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