Determining the Location of the Dispersionless Injection Boundary During Substorms

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Magnetic Storms, Substorms, Energetic Trapped Particles

Scientific paper

Particle acceleration in the inner magnetosphere during magnetospheric substorms is usually manifested with the appearance of particle injections, i.e. with sudden enhancements in the fluxes of energetic electrons and ions. Injections that show simultaneous flux increases in all energy ranges of a detector are called ``dispersionless injections'' whether particle injections will appear to be dispersionless depends on the location of the spacecraft relative to the injection region. How particles of different energies can be transported to inside geosynchronous orbit without dispersion and where these particles come from are long standing issues in magnetospheric physics. We present a modeling study of the extent and temporal evolution of the region where particle acceleration and Dispersionless injections occur. The study is based on simulation results from a model of the expansion of the electric and magnetic fields associated with a substorm. The model that we use is able to reproduce simultaneous particle flux measurements from various spacecraft locations with considerable success.

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