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CRRES observation and STEERB simulation of the 9 October 1990 electron radiation belt dropout event

We examine and simulate the electron radiation belt dropout event on 9 October 1990. CRRES observations show that significant depletions of electron fluxes occurred at energies ∼0.1–1.0 MeV beyond 6 RE and at energies > ∼0.4 MeV within 6 RE. The three‐dimensional kinetic radiation belt model STEERB is used to simulate this dropout event, taking into account the magnetopause shadowing, adiabatic transport, radial diffusion, and plume and chorus wave‐particle interactions. Our results show that STEERB code can basically reproduce the observed depletion of ∼0.1–1.0 MeV electron fluxes throughout the outer radiation belt, suggesting that the competition and combination of all these physical mechanisms can well explain this electron radiation belt dropout event.