Stable Does Not Mean Static

• Outer Zone - Solar Wind & Ionospheric Electrons & Ions

• Inner Zone - Cosmic Ray Neutron Decay

• Trapped Heavy Ions - Interplanetary Particles

• Others

  • In Situ Acceleration
  • Artificial, e.g. Starfish Explosion

Sources

Losses

• Collisions with Earth’s Atmosphere

• Collisions with H in the Exosphere

• Collisions with Particles in the Plasmasphere

Short Term Variations in Populations

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