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EP: Fachverband Extraterrestrische Physik

EP 8: Sun and heliosphere III

EP 8.2: Talk

Wednesday, March 22, 2023, 16:30–16:45, ZEU/0160

Studies of energetic particle transport in synthetic turbulence with intermittency features — •Frederic Effenberger, Jeremiah Lübke, Horst Fichtner, and Rainer Grauer — Ruhr-Universität Bochum, Theoretische Physik

The transport of fast charged particles in turbulent magnetic fields is a key research topic in space- and astrophysics. In particular, regimes of superdiffusive or subdiffusive propagation and interactions with large and small-scale coherent features are important to study in more detail. A common approach to investigate turbulence-particle interactions is based on full-orbit calculations of test-particle trajectories in artificially generated turbulence. These turbulence models have the advantage, when compared to an MHD approach, that they can potentially cover a wider dynamical range of turbulence scales. However, almost all synthetic turbulence models to this date only include second-order Gaussian statistics and thus fail to include coherent structures and intermittent features. Our new model is based on a continuous wavelet transform of a log-normal cascade process, which results in realistic intermittent scaling properties. We investigate the particle transport properties by solving a large number of particle orbits in these synthetic turbulence realisations and specifically look for non-diffusive regimes and non-standard energy dependences resulting from the intermittency of the generated fields. The implications for solar energetic particle and cosmic ray transport are discussed.