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 inject ed upward at 700 km during the first time step (10(-4) s) and allowed to sc atter and decay through collisional interactions with neutral particles and the core plasma. The maximum pulse duration for collisional processes to p revail 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 tim e 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.