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Interhemispheric transport of relativistic electron beams

Relativistic electron beam injection simulation results are presented from a new interhemispheric transport model, with a spatial domain reaching from 90 km to 90 km in the conjugate ionospheres. A single beam pulse is injected upward at 700 km during the first time step (10−4 s) and allowed to scatter and decay through collisional interactions with neutral particles and the core plasma. The maximum pulse duration for collisional processes to prevail over the wave‐beam instabilities is estimated, and the assumed pulse length is well within this limit. For an L=2 field line, the e‐folding time of a 5 MeV beam is 265 s, which is much bigger than the bounce period (0.19 s) and comparable to drift period around the Earth.