Interpretation of Anomalies of Galactic Cosmic Rays with Spatially Dependent Propagation Model
Title: Interpretation of Anomalies of Galactic Cosmic Rays with Spatially Dependent Propagation Model
Speaker: Dr. Yuhua Yao (Chongqing University)
Time: 09:45am, August 24, 2023
Location: 3-201, PMO Xianlin Campus
Abstract: Recent observations of cosmic rays have revealed a two-component spectra anomaly observed across all primary and secondary particles, as well as the connecting ratios within the galactic plane. Our study proposes a syngenetic origin for this phenomenon, suggesting it originates from two diffuse regions. This scenario naturally reproduces all anomalies, except for the positron spectrum. Specifically, the TeV energy break in the electron spectrum represents a transition from diffusion-dominant to energy cooling-dominant effects. Additionally, extending the two-component spectra model to the entire galactic plane allows us to recreate ultra-high energy emissions detected by the ASγ experiment. Our work establishes a clear framework for understanding the formation of galactic cosmic rays. High-energy cosmic rays primarily originate from recent accelerators and remain confined to nearby locations, while low-energy cosmic rays predominantly come from remote sources in the galactic sea. In summary, cosmic rays below 200 GV originate from the galactic sea, while those above 200 GV, including those at the knee position, primarily stem from nearby sources.