Following a PhD at LPC2E/CNRS on the interpretation of an experiment on-board the US Space Shuttle, I entered CEA in 1995 as a scientist in the broad domain of plasma physics. First, I participated in evaluating detrimental parametric instabilities for the project Laser Mégajoule. Next, I moved on to work in the domain of space plasma physics. Such theoretical, experimental, and numerical studies mainly focus on quasi-linear and non-linear wave-particle interactions in the Earth’s magnetosphere. Our main goal is to develop models of the dynamics of 50 keV to 5 MeV electrons inside the Van Allen radiation belts in response to variations of solar activity. Solar wind impulses can lead both to the precipitation of these energetic particles into the atmosphere and/or to an increase of their in-situ flux level. Such studies are based on satellites data and performed in close collaboration with various universities and institutions, such as UCLA, Berkeley, and CNRS.