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Space Radiation Environment

Space Radiation Environment. Introduction. Introduction The Earth's magnetic field Charged particle motion The radiation belts Description South Atlantic Anomaly Dynamics of the radiation belts Models The sources of energetic particles outside the magnetosphere Solar flares Cosmic rays

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Space Radiation Environment

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  1. Space Radiation Environment

  2. Introduction • Introduction • The Earth's magnetic field • Charged particle motion • The radiation belts • Description • South Atlantic Anomaly • Dynamics of the radiation belts • Models • The sources of energetic particles outside the magnetosphere • Solar flares • Cosmic rays • Magnetospheric shielding • Sensitivity of orbits to the radiations

  3. Introduction shock

  4. Dipolar magnetic field tilted and off-center with respect to Earth The Earth's magnetic field Dipolar magnetic field lines

  5. 70° Magnetic coordinates 76° 80° 80° 90° The Earth's magnetic field Earth's magnetic field, external component. Tsyganenko 1982 model

  6. Lorentz force Giration motion V B Larmor radius: Cyclotron period: Magnetic moment: α F (q,m) α: pitch angle Charged particle motion

  7. 90° Beq Bm αeq αc V * Mirror points Loss cone Charged particle motion Bounce motion

  8. q<0 q>0 Charged particle motion Drift motion

  9. Electron Proton Drift shell Charged particle motion

  10. The radiation belts - Description

  11. The radiation belts - description Proton radiation belt Electron radiation belt

  12. 06 LT Drift shells 24 LT 12 LT 18 LT The radiation belts - description LANL 1989-046 / 315-500 keV electron GEO Local noon Local noon

  13. 9.4 MeV proton - 710 km - SAC-C/SPICA 460. keV electron - 710 km - SAC-C/SPICA The radiation belts - The South Atlantic Anomaly

  14. The radiation belts - Dynamics of the radiation belts Atmospheric densities Protons Solar cycle time scale Cosmic neutrons

  15. The radiation belts - Dynamics of the radiation belts Electrons Solar cycle time scale

  16. The radiation belts - Dynamics of the radiation belts Electrons - Magnetic storm time scale 100 keV 12:00 06:00 18:00 00:00

  17. The radiation belts - Dynamics of the radiation belts Electrons - Magnetic storm time scale 500 keV 12:00 06:00 18:00 00:00

  18. The radiation belts - Models Static models - NASA AP8 AE8 E > 10 MeV E > 1 MeV

  19. POLE (keV-1 cm-2 s-1) Year relative to solar maximum The radiation belts - Models Static models - NOAA PRO & POLE NOAA PRO

  20. The radiation belts - Models Dynamic models - CRRESPRO & CRRESELE CRRES QUIET PROTON MODEL CRRES ACTIVE PROTON MODEL

  21. The radiation belts - Models Comments

  22. Sensitivity of orbits to the radiations

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