Variations - Protons

• Fairly Stable

• Cyclic Modulations Due to the Solar Cycle ~ 2

  • Lowest Levels Are at Peak of Solar Maximum
  • Highest Levels Are at Lowest Point in Solar Minimum
  • Rate of Change ~ 6%/year

• Geomagnetic Field Shift Changes Location

  • ~ 6 ° westward / 20 years

• Anisotropy at Inner Edge (300-500 km) 2 ~ 7

• Particle Increases at Outer Edge - New Belts

  • Geomagnetic Storms

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