In this internship, we propose to study the gravity waves generated by atmospheric storms. The objective of the internship will be to set up a measurement chain to map the TEC using GNSS data from the RENAG network made up of around 80 GNSS receivers in France. These data will be retrieved for days when significant storms have been identified in France over the last three or four years. From the maps obtained, we will characterize the amplitude of the disturbances and their dimension. In accordance with the commitments made by the CEA in favor of the integration of people with disabilities, this job is open to everyone. Participating in national protection, an administrative investigation is carried out for all CEA employees in order to ensure the integrity and security of the nation.