Where are these energetic particles coming from?

• Not the solar wind! (too energetic)

• Can they be trapped particles? (wrong pitchangles, wrong place)

• Are they just locally accelerated? W/O drift?

• What are the mechanisms for accelerating particles to high energy very quickly?

• How do we do it on Earth? Cyclotron & Linear accelerators or stochastic vs. resonant. Can the magnetosphere be doing the same thing?

• Cyclotrons & Linacs