Speaker
Mr
Patomporn Payoungkhamdee
(Mahidol University)
Description
Cosmic rays (CRs) are high energy particles in space, mainly protons, for which the spectrum is well described by a power law. Recent measurements from PAMELA and AMS-02 indicate an abrupt change of the CR proton spectral index at $\sim$300 GeV. When CRs interact with the Earth's upper atmosphere, gamma-ray ($\gamma$-ray) photons can be produced and detected by space-based detectors. We use the Earth's $\gamma$-ray data observed by the Fermi Large Area Telescope (Fermi-LAT) along with proton-air interaction model perform Monte Carlo simulation and determine the CR proton spectral indices that best fit the $\gamma$-ray data.
Author
Mr
Patomporn Payoungkhamdee
(Mahidol University)
