Maps
Webmail
Home > About us > Media > Archived news > 2023 > Pauline Simon defended her PhD "From isotropic pressure to pressure anisotropy in turbulent space plasmas: Analytical, numerical and observational investigations"
Pauline Simon defended her PhD "From isotropic pressure to pressure anisotropy in turbulent space plasmas: Analytical, numerical and observational investigations"
All the versions of this article: [English] [français]
On September 22, 2023, Pauline Simon defended her PhD "From isotropic pressure to pressure anisotropy in turbulent space plasmas: Analytical, numerical and observational investigations".
Abstract:
The Solar Wind (SW) is a plasma, an ionized gas that interacts with the magnetic and electric fields and is ejected by the Sun, in the interplanetary space. In this medium, the pressure is not defined as a single quantity, but rather by, at least, two quantities, parallel and perpendicular to the magnetic field. Such anisotropy impacts the plasma that can become unstable. The SW is also a turbulent fluid. The turbulence results in a cascade of energy from large scales to small ones, where the energy can heat the plasma. In this work, we investigate the impact of the pressure anisotropy on the turbulence of the SW. The first step is analytical and extends the theory of Kolmogorov that gives an estimation of the turbulent cascade rate, to all types of pressure. Then a numerical study is led to understand the impact of this extension in our interpretation of a turbulent behaviour.
Jury :
Dr. Alain Noullez, Directeur de recherche, CNRS/LAGRANGE (Rapporteur)
Dr. Luca Sorriso-Valvo, Chercheur, CNR/ISTP (Rapporteur)
Dr. Katia Ferrière, Directrice de recherche, CNRS/IRAP (Examinatrice)
Dr. Lorenzo Matteini, Chercheur, Imperial/SPAT (Examinateur)
Prof. Frédéric Daigne, Professeur des universités, SU/IAP (Examinateur)
Dr. Fouad Sahraoui, Directeur de recherche et professeur, CNRS/LPP/X (Directeur)
Prof. Sébastien Galtier, Professeur des universités, UPSy/LPP (Co-directeur)
Also in this section :
- 1st HelioSwarm France Science Day (LPP, May, 5 2023, Paris)
- LPP at the general congress of the French Physics Society, celebrating its 150th anniversary
- Entanglement between magnetic reconnection and turbulence in astrophysical plasmas
- Ripples at the surface of the terrestrial bow-shock when the solar wind blows at high Mach numbers
- Day in memory of Nicole Cornilleau on September 25
- Vincent David defended his PhD "Multiscale solar wind turbulence: from theory to observations"
- Interdisciplinary collaboration on wave turbulence
- BepiColombo/Mio detects the first high-frequency electromagnetic waves in Mercury’s plasma environment
- A stereo view of the Sun’s magnetic field
- Science Festival 2023
- LPP researchers contribute to two books to popularize physics
- Pierre Morel defended his HDR "Contribution à l’étude des instabilités, de la turbulence, et du transport, dans les plasmas magnétisés"
- COMHET: a new stage in the LPP/SAFRAN collaboration on electric thrusters
- Jean-Paul Booth receives the Nishizawa 2023 Award
- Chen Xing defended his thesis on the role of magnetic reconnection in the evolution of solar eruptive flux ropes
- Sae Aizawa has been recruited as Researcher by the CNRS to work in the space plasma team at LPP
- Tarek Ben Slimane defended his PhD "Investigation of the Optical Emission of Hall Effect Thrusters using Collisional Radiative Models, PIC Simulations, and Machine Learning"
- Gaetan Gauthier defended his PhD "Study of non-linear electronic structures in the magnetosphere and so- lar wind : theory and simulations"
- A new book by Sébastien Galtier : ’Physics of Wave Turbulence’
- Catherine Krafft becomes a Senior Fellow of the Institut Universitaire de France (IUF)
