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Reference : UMR5277-CHRFEU-005
Workplace : TOULOUSE
Date of publication : Monday, May 03, 2021
Scientific Responsible name : Alexis Rouillard
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 September 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
Helium plays an important role in the structure and dynamics of the corona and solar wind. The underlying physics controlling first the extraction of helium from the chromosphere to the corona and then its heating and acceleration in the solar wind is poorly understood and still debated. In spite of the non-linear processes supposed to regulate the helium abundance in the solar wind, it presents a rather simple relation with the solar wind speed and the level of solar activity. In situ measurements of this abundance suggest that there are two sources of slow solar wind, one of which dominates at solar minimum and is associated with the streamer belt, the other at solar maximum, which depends on the number of active regions. The proposed thesis aims at investigating the physical mechanisms that can explain the variations of helium abundance in the solar wind and will rely on a new multi-species numerical model of the solar wind, which allows to model the coupled transport of neutrals and charged particles through the different layers of the solar atmosphere by taking into account the interactions between the Alfvén waves and particles. The simulations will serve as a basis for the interpretation of in situ measurements of alpha particles obtained by the Solar Orbiter and Parker Solar Probe probes en route to the solar corona.
This thesis will be carried out with the SLOW_SOURCE team (http://slow-source.irap.omp.eu/) and is funded by the European Research Council (ERC).
Thesis director : Alexis Rouillard, PI of Slow Source Poject
ThseisCo-director : Pierre-Louis Blelly
Constraints and risks
Possible travels out of France
Means at your disposal : Equipment, computing, ... PC, computing cluster.
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