Preliminary Investigation of the Radiation Belt Seed Population using Multisatelitte Observations of Electron Injections

One of the science goals for the RBSP mission is to investigate the role of the "seed population" for relativistic particle events. One potentially important source of these seed particles are substorm electron injections. These injections begin in the tail and evolve both tailward and earthward. The electrons can be energized as they move earthward, where they could serve as a seed population for the outer radiation belt. In order to understand how these events evolve, we investigate several injection events from 2008-2009 using THEMIS, CLUSTER and Geostationary observations where available. For each event we use a global magnetic field model in order to conserve the first adiabatic invariant and compare corresponding particle populations in the tail and at geostationary orbit. This study serves a precursor to the availability of RBSP data, which will allow the observation of particles inside geostationary orbit and help examine the importance of injected electrons as a seed population for the outer electron belt.