Observation of time evolution of cosmic ray electron and positron flux with Dark Matter Particle Explorer
2019 July 22
In this analysis, we measure the time-dependence of the primary cosmic ray electron and positron (CRE) fluxes using over 3 years of data from the Dark Matter Particle Explorer (DAMPE). The monthly CRE fluxes show clear variabilities due to the solar modulation effect. We also investigate the short-term structures of the CRE fluxes in September, 2017 when an X level solar flare event occurred. Energy-dependent Forbush descreases have been observed. The Forbush decrease amplitude and recovery time of the CRE fluxes depend on energies, which may have interesting implication in understanding the disturbances of interplanetary environment due to solaractivities. All these results indicate that the DAMPE has a great potential to probe the interplay between particles and the heliosphere environment.