Trapped radiation models

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Presentation transcript:

Trapped radiation models SPENVIS Final Presentation 14 December 1999 Trapped radiation models D. Heynderickx Belgisch Instituut voor Ruimte-Aëronomie Ringlaan 3, B-1180 Brussel D.Heynderickx@oma.be BIRA/IASB

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

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

Trapped proton population

Trapped electron population

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

The South Atlantic Anomaly (SAA)

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

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

Impulsive penetration

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

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

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

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