Doctorant : SARRIA David
Directeur : BLELLY Pierre-Louis
Date début : Octobre 2012
Groupe Thématique : PEPS
Onboard TARANIS satellite, the CNES mission dedicated to the study of TLE and TGFs, IDEE and XGRE are the two instruments which will measure the relativistic electrons and X and gamma rays. At the altitude of the satellite, the fluxes have been significantly altered by the filtering of the atmosphere and the satellite only measures a subset of the particles. Therefore, the inverse problem, to get an information on the sources and on the mechanisms responsible for these emissions, is rather tough to tackle, especially if we want to take advantage of the other instruments which will provide indirect information on those particles. The only reasonable way to solve this problem is to embed in the data processing, a theoretical approach using a numerical model of the generation and the transport of these burst emissions. For this purpose, we start to develop a numerical Monte carlo model which solves the transport in the atmosphere of both relativistic electrons and gamma-rays. After a brief presentation of the model and the validation by comparison with GEANT 4, we discuss how the photons and electrons may be spatially dispersed as a function of their energy at the altitude of the satellite, depending on the source properties, and the impact that could have on the detection by the satellite. Then, we give preliminary results on the interaction of the energetic particles with the neutral atmosphere, mainly in term of production rate of excited states, which will accessible through “MicroCameras and Photometers” (MCP) experiment (onboard the TARANIS spacecraft), and ionized species, which are important for the electrodynamics.