Speaker
Yu On Xu
(The Chinese University of Hong Kong)
Description
We present a simulation study of Earth albedo gamma-ray intensity as observed by the Fermi Large Area Telescope (LAT), and its dependence on geomagnetic cutoff rigidity of cosmic ray proton. We perform Monte Carlo simulations of particle interactions in the Earth’s atmosphere using GEANT4, including the effects of the geomagnetic field. Our simulation result confirm the correlation, previously reported in Fermi LAT observations, between the Earth’s limb gamma-ray intensity and the geomagnetic cutoff rigidity of primary cosmic ray protons. This work is relevant for studies of geomagnetic field and for near-Earth spacecraft missions.
Primary authors
Yu On Xu
(The Chinese University of Hong Kong)
Kenny C. Y. Ng
(The Chinese University of Hong Kong)
Chingam Fong
(The Chinese University of Hong Kong)
Zhe Li
(Institute of High Energy Physics)
