Speaker
Description
Currently, solar activities are in the peak year of Cycle 25 (2024 - 2025), with frequent coronal mass ejections (CMEs)and high - energy particle stream events. Our research by using PRISMA - TU - 4 focuses on the impact of such activities on cosmic rays, such as the Forbush decrease (FD) and the Ground - Level Enhancement (GLE). PRISMA - TU - 4 is an observation system composed of four Electron - Neutron detectors (EN - detectors), which is used to study the correlation between the solar activity cycle and the cosmic ray modulation effect. Each detector of PRISMA - TU - 4 is designed based on the 6Li isotope target material (6Li + n → 3H+α + 4.8 MeV), capturing thermal neutrons and radioactive isotopes in the environment and recording their flux changes. The detectors are installed at the University of Tibet (at an altitude of 3650 meters). Relying on the geographical advantage of the thin atmosphere in the plateau area, the absorption loss of cosmic ray secondary particles is significantly reduced, thus improving the detection sensitivity to weak thermal neutron signals. This report will introduce the data analysis methods of PRISMA - TU - 4. Through data quality inspection, multi - environmental parameter correction, and filtering algorithms, the impacts of seasonal fluctuations in atmospheric density and local meteorological conditions are eliminated, enabling high - confidence identification of signals, and presenting the analysis results of events such as FD and GLE triggered by solar activities.