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Trapped radiation models

Trapped radiation models. D. Heynderickx Belgisch Instituut voor Ruimte-Aëronomie Ringlaan 3, B-1180 Brussel D.Heynderickx@oma.be. Earth’s Van Allen belts. Galactic cosmic rays. Solar energetic particles. Secondary (albedo) radiat i on. Radiation belts. Charged particle trapping.

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Trapped radiation models

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  1. Trapped radiation models D. Heynderickx Belgisch Instituut voor Ruimte-Aëronomie Ringlaan 3, B-1180 Brussel D.Heynderickx@oma.be

  2. Earth’s Van Allen belts Galactic cosmic rays Solar energetic particles Secondary (albedo) radiation Radiation belts

  3. Charged particle trapping • Particle motion: gyration, bounce, drift • Guiding centre approximation: McIlwain’s (B,L) coordinates • Model description: J(E,B,L)

  4. Trapped proton population

  5. Trapped electron population

  6. The South Atlantic Anomaly • Low altitude part of radiation belts • Tilt and shift of geomagnetic field: Fraser-Smith, Rev. Geophys., 25, 1, 1987 • Interaction with neutral atmosphere http://www.spenvis.oma.be/spenvis/help/background/magfield/cd.html

  7. The South Atlantic Anomaly (SAA)

  8. Trapped proton variability • Seasonal • Secular variation of geomagnetic field • Impulsive • Solar cycle

  9. Secular variation AP-8 MIN SAMPEX/PET Directional proton flux >18 MeV at 500 km

  10. Impulsive penetration

  11. CRRESELE Equatorial L profiles Parametrized in terms of Ap15: 15 day average of Ap

  12. Available models • De facto standard models: NASA AP-8 and AE-8 • Advantages of the NASA models: • Widespread usage (heritage) • Full spatial coverage and energy range • Disadvantages of the NASA models: • Represent radiation environment of the 60’s and 70’s • Static models (but probably ok for long time averages) • Contamination by Starfish electrons • Other models: • CRRESPRO, CRRESELE • NOAAPRO • POLE • SAMPEX/PET

  13. Replacement of AP-8 and AE-8 • New models do not have sufficient spatial and/or temporal coverage and/or energy range • Incomplete energy range can lead to misleading effects estimations

  14. Standardisation efforts • COSPAR Panel for Radiation Belt Environment Modeling (PRBEM) http://wwwe.onecert.fr/craterre/prbem/ • NASA working group meeting: • Focus efforts on selected regions of space and energy ranges to expedite AP-8 and AE-8 replacement • POLE model for GEO • SAMPEX/PET+NOAAPRO for LEO protons • ONERA/LANL GPS modelling for MEO • RERMM study: use data from different satellites + Salammbô numerical simulation to produce ‘ad hoc’ models

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