Laboratoire d'études spatiales et d'instrumentation en astrophysique

Director: Pierre Drossart
Location: Meudon
Keywords: Space and ground-based instrument conception, space plasma physics, heliosphere, low frequency radio, numerical simulations

Logo-LESIA-lr The LESIA is one of the five Scientific departments of the Paris Observatory. It is also a CNRS Laboratory, and associated with the University Pierre et Marie Curie and the University Paris-Diderot. It is one of the largest French laboratories of research in astrophysics (approximately 12% of the discipline). The main goals of the lab are (i) the design and implementation of space and ground-based scientific instruments, (ii) the analysis and interpretation of scientific observations made by use of the produced instruments. LESIA’s scientific activities are classified in five main themes: Star, High Angular Resolution and Astrophysics, Planetology, Plasma Physics and Solar Physics.

Solar Physics group

Team Leader: Etienne PARIAT
Location: Meudon

Two main fields are studied: « Formation and structuration of the solar magnetic fields », « eruptive phenomena and particles acceleration ». The works are based on data analysis from either ground-based solar instruments (like radio-telescopes of the Nançay station the or THEMIS optical telescope) or space missions (like RHESSI, STEREO, SDO or HINODE). In addition, MHD simulations are used to understand the mechanisms behind of the surge of filaments or other eruptive events.

Plasma physics

Team Leader: Filippo PANTELLINI
Keywords: Radio LF, kinetic simulations, solar wind, planetary magnetospheres

Two main fields are studied: « Solar wind and interplanetary medium », « Earth and planetary magnetosphere ». From the instrumental point of view, the speciality of the group is the radio receptors in the low frequency range (1-10MHz) for space missions of NASA and ESA (like Bepi-Colombo and Solar Orbiter for the next generation) and the receptors 10-80MHz for ground-based instruments (like LOFAR, NENUFAR or decameter array in Nançay). The observations from these instruments enable studies on plasma instabilities, turbulence in the interplanetary medium and planet environments, on the mechanisms at the origin of the aurorae and on the dynamics of the (inter)planetary plasma. The data analysis are completed by numerical simulations (N-corps, Hybrid and Vlasov).