LESIA is a laboratory of the Paris Observatory which is itself an institute of PSL university. LESIA is also a mixed research unit of the CNRS. It counts roughly 200 employees and is located in Meudon. The PhD student will work within the Heliosphere and Astrophysical Plasmas (HPA) division.
The sun sporadically ejects bubbles of plasma of an initial characteristic size of the order of the radius of the Sun. These huge bubbles of plasma called coronal mass ejections (CME) expand at speeds of several hundred km/s invading large areas of the heliosphere with measurable effects up to distances of several tens of astronomical units from the Sun. Coronal mass ejections are the consequence of sudden rearrangements of the magnetic field in the solar corona and are sometimes associated with an increase in the flux of energetic particles of solar origin observed at 1 AU. On Earth, at ground level, the frequency of these burst of energetic particles is of the order of once a year. It is generally accepted that these energetic particles, which can reach energies of the order of GeV, are accelerated in the solar corona, near the birth location of the CME, or at the shock formed by the interaction of the ejected plasma bubble with the surrounding solar wind. The objective of the thesis is to simulate the expansion and propagation of the CME with the MPI-AMRVAC code (described in detail on the amrvac.org site) and to use the test particle technique to simulate the acceleration and the propagation of high energy particles.Web site for additional job details
https: // emploi.cnrs.fr/Offres/Doctorant/UMR8109-SYLDES-053/Default.aspxRequired Research Experiences
Astronomy › Astrophysics
Astronomy › Cosmology
Astronomy: Master Degree or equivalent
FRENCH: BasicContact Information