Modeling the Global Distribution of Chorus Wave Induced Relativistic Microburst Spatial Characteristics

The full spatiotemporal distribution of chorus wave-induced relativistic electron microburst is modeled for chorus waves originated from different L shells and MLTs, based on the newly developed numerical precipitation model (Kang et al., 2022, ). The wave-particle interaction process that induces each microburst is analyzed in detail, and its relation to the chorus wave propagation effects is explained. The global distribution of maximum precipitation fluxes and scale sizes of relativistic microbursts is then obtained by modeling chorus waves at different L-shells and local times. The characteristics of dawn and midnight sector microbursts have little difference, but the noon sector has much larger maximum flux and much smaller full width at half maximum, which may be due to dayside's low electron flux in the Landau resonance range. This suggests the controlling effect of keV electrons on the MeV electron precipitation intensity and properties and the overall relativistic electron loss in the outer radiation belt. Based on statistical chorus and electron distributions, the global distribution of relativistic microburst scale size is modeled Dawn and night sectors are fairly similar in precipitation scale size, and dayside has larger maximum precipitation flux and smaller width The keV electron populations on dayside play a critical role on the MeV electron precipitation intensity and the microburst scale size