Toward operational use of radiation belt models D. Heynderickx BIRA, Ringlaan 3, B-1180 Brussel, Belgium

Definition of terms: “radiation belts” “models” “operational use” Operational use of existing models Static models Dynamic models Alternative approach: ad-hoc construction of radiation belts from multi-point observations and physical model Toward operational models Overview

“Radiation belts”: trapped proton and electron population from 100km to GEO orbit and just beyond Characterised by energy, spatial location, and epoch (for time dependent models) AP-8 & AE-8 cover spatial region and most of the energy range, but no time dependence Other models (CRRESPRO, CRRESELE, NOAAPRO, PSB97, POLE, …) only have partial coverage (location, energy, time) “Models”: Current models are lookup tables of fluxes in terms of energy, magnetic coordinates, magnetic or solar wind indices, time “Operational use”: Real time runs for actual spacecraft locations and magnetospheric conditions Definition of terms

Spacecraft location and epoch for model runs: From orbit generator Actual spacecraft ephemeris Radiation belt model needs to be integrated with coordinate generator (conversion of geographic to magnetic coordinates) Local runs of tailored applications Remote runs of standard applications (e.g. SPENVIS) Use of static models: Inputs are limited to location and energy “Static” tools can be built and run locally or remotely Use of dynamic models: Similar to static models, but extra input is needed: magnetic or solar wind indices IRI model: index data file updated on regular intervals Automatic retrieval of indices from services (e.g. SWENET)SWENET Operational use of existing models

ESA study RERMM (Radiation Environment Research from Multiple Monitors): ONERA, BIRA, UCL, DMI, QinetiQ, P. Bühler Provide on-line access (via WWW interface) to data from instruments on different European spacecraft (XMM, Integral, PROBA, HEO3, SAC-C) Data selection and graphical representation (using SEDAT) Cross-calibration of measurements Combination with Salammbô runs to generate maps of the radiation belts “Fly” a spacecraft through the generated maps: interpolate maps to spacecraft locations and specified energy range Ad hoc generation of radiation belt maps

New generation of radiation belt models should take into account operational use: Integration with other tools and software (interface requirements) Limit magnetic and solar wind indices to those available in (near-) real time External magnetic field model shouldn’t require additional indices Standardisation: Ingestion of spacecraft locations Ingestion of model parameters (magnetic and solar wind indices, energies) Conversion to magnetic coordinates (software libraries: UNILIB, ONERA toolkit, …) Model outputs (flux or fluence) for use in other tools (spacecraft effects models, graphical representation, warning systems, …) Toward operational models