Speaker
Description
The KM2A array of the LHAASO experiment, leveraging its unprecedented high statistical accuracy and daily sampling period, has achieved the daily observation of the cosmic ray sun shadow. This study aims to utilize solar photospheric magnetic field data (HMI/ADAPT) in combination with the PFSS model to extrapolate the coronal magnetic field, and to conduct particle back-tracking simulations based on G4Solar, reconstructing the cosmic ray sun shadow on different time scales (year/day) and energy ranges. By comparing the simulation results with LHAASO-KM2A data, the accuracy of existing magnetic field models is evaluated, and the effects of activity cycle variations and short-term solar activity on the morphology of the sun shadow are explored.
