Presentation materials
Physics-based models of the radiation belts can provide time-dependent simulations of the high-energy electron flux, taking into account processes such as radial transport, wave-particle interactions, collisions with the atmosphere and losses to the magnetopause. To successfully reproduce observations, the simulations require appropriate boundary conditions and accurate descriptions of each of...
Data assimilation is a term used to describe various algorithms that help reconstruct the global state of evolution of the system from observations contaminated by noise. The most commo technique for the sequential data assimilation is called Kalman fileter ( Kalman 1960) produces sequential updates for the model forecasts using data. In this process the predictions of the physics based model...
Ensemble Kalman filter based on the Salammbô code has been developed for years at ONERA. Model and data uncertainties are introduced in the filtering method so that uncertainties on the restitution are also available.
Re-analysis data based have been produced from the data assimilation tool and from the Salammbô code. Results will be presented and their uses in specification model development...
Solar cycle variations of low altitude protons are implicitly contained in the IRENE flux maps. However, IRENE users have requested an explicit solar cycle variation. Inclusion of such a model will require modifications to the IRENE data processing, flux maps, and software. We have developed simple models of the solar cycle variation based on the Selesnick Inner Zone Proton model (SIZM) and on...
First released in 2012 and most recently updated in Version 1.55, the AE9/AP9-IRENE (International Radiation Environment Near Earth) model suite includes a standard plasma model (SPM), which extends the environmental specification from the traditional radiation energies of AE8/AP8 down to 1 keV for protons and electrons, while also adding helium and oxygen plasmas. As the IRENE suite evolves...
First released in 2012 and most recently updated in Version 1.55, the AE9/AP9-IRENE (International Radiation Environment Near Earth) model suite provides the satellite design community with climatological specification of the near-Earth particle radiation environment for design and mission planning. The model is maintained with periodic releases improving both specification (via new or...
The dynamical evolution of the outer belts should be a delicate balance among several processes. In order to discriminate what physical processes are dominant for the large flux enhancement of the outer belt electrons, we have developed the data assimilation code on the outer belt electrons. In our data assimilation, the particle filter and the particle smoother are used for the assimilation,...
