BEXCO - Room C(109/110)
[SH057] Observation of the Forbush decrease of 22 June 2015 with the LAGO detector in Brazil
This work investigates the spatial and temporal invariance in the spectra of energetic particles in gradual solar events. In the ecliptic at 1 AU, the time profiles of particle fluxes with different energies are calculated in simulations. According to simulation results, we find that shock acceleration strength, parallel diffusion, and adiabatic cooling are the main factors in forming the spatial invariance in SEP spectra, and perpendicular diffusion is a secondary factor. Furthermore, the temporal invariance in SEP spectra is mainly due to the effects of adiabatic cooling.