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Energy transfer and proton-electron heating in turbulent plasmas

Presentation #104.02 in the session Towards the Cross-Scale Energy Transfer in Space Plasmas.

Published onOct 20, 2022
Energy transfer and proton-electron heating in turbulent plasmas

Despite decades of study of high-temperature weakly-collisional plasmas, a complete understanding of how energy is transferred between particles and fields remains elusive. Two major questions in this regard are how fluid-scale energy transfer rates associated with turbulence connect with kinetic-scale dissipation, and what controls the fraction of dissipation on different charged species. Using kinetic simulations and in-situ spacecraft data, we show possible connection between the fluid-scale energy flux and the energy dissipation rate, as measured by pressure-strain interaction. The global dissipation rates show contrasting behavior in comparison to reconnection events. We discuss possible explanations of this discrepancy.

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