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Microscale Dynamics and Non-Maxwellian Equilibria: Decoding Collisionless Processes in the Space Plasmas

Project description

Microscale turbulence and its role in non-Maxwellian equilibria of space plasmas

Accretion disks, intracluster medium and the heliosphere all consist of plasma, the most common state of matter in the universe. Plasmas are effectively collisionless so the velocity distribution of charged particles like electrons is not bound by conventional Maxwell-Boltzmann thermodynamic equilibrium. However, non-Maxwellian equilibria can exist and such equilibria may be universal. With the support of the Marie Skłodowska-Curie Actions programme, the MicroDynaMIQ project aims to characterise these special equilibrium plasma states in the heliosphere by combining spacecraft observations, kinetic theory and numerical simulations. The findings could transform our understanding of the statistical thermodynamics of microscale turbulence in shaping these equilibria in collisionless plasma throughout the universe.

Objective

Plasma is the most common state of matter in the Universe. In most plasma environments, such as accretion disks, intracluster medium, and the heliosphere, the interparticle collision frequency is much smaller than the characteristic particle time scale, so the plasma is effectively collisionless. As a result, the velocity distribution function of charged particles, such as electrons, is not bound to the Maxwell-Boltzmann thermodynamic equilibrium. Nevertheless, stable non-Maxwellian equilibria can exist in collisionless plasma. In particular, recent advances using Lynden-Bell statistical mechanics theory and kinetic Vlasov theory of electrostatic turbulence suggest that non-Maxwellian equilibria are universal. This project aims to understand the varieties of such equilibria and their universality in the heliospheric plasma. To this end, we will propose an innovative data-driven approach, combining in situ observations from state-of-the-art spacecraft, theory, and numerical simulations, to characterise the non-Maxwellian equilibria. Using in situ spacecraft observations, we will statistically describe the different non-Maxwellian equilibria in the heliosphere. In addition, we will use kinetic Vlasov theory and numerical simulations to show how microscale turbulence shapes these equilibria through the interaction between electrons and electromagnetic fields. Together, these steps are designed to help us understand and conceptualise the statistical thermodynamics of a collisionless, turbulent plasma at a new level.

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HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships

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(opens in new window) HORIZON-MSCA-2025-PF

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Coordinator

THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF OXFORD
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 260 347,92
Address
WELLINGTON SQUARE UNIVERSITY OFFICES
OX1 2JD Oxford
United Kingdom

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Region
South East (England) Berkshire, Buckinghamshire and Oxfordshire Oxfordshire
Activity type
Higher or Secondary Education Establishments
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Total cost

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