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EP: Fachverband Extraterrestrische Physik

EP 12: Sun and Heliosphere V

EP 12.1: Hauptvortrag

Donnerstag, 3. April 2025, 16:15–16:45, ZHG101

The Influence of Intermittent Turbulence on Solar Energetic Particle Transport: Modelling and Observations — •Frederic Effenberger — Ruhr-Universität Bochum

The detailed understanding and ultimately the ability to forecast solar energetic particle (SEP) events is critical in our efforts to mitigate space weather risks. I will discuss current issues in SEP modelling and observations, highlighting the capabilities under development at Ruhr-University Bochum. Of particular interest are coherent features in the solar wind turbulence that can influence particle transport behaviour. Synthetic fields to study particle transport are typically generated from superpositions of Fourier modes with a prescribed power spectrum and uncorrelated random phases, bringing the advantage of covering a wide range of turbulence scales at manageable computational effort. However, almost all of these models to date only account for second-order Gaussian statistics and thus fail to include intermittent features, as observed in more realistic but expensive direct magnetohydrodynamic simulations. We have developed novel methods to account for such shortcomings, including a minimal Lagrangian map approach. 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. Applications to SEP transport and acceleration and their connections to recent observations by Parker Solar Probe and Solar Orbiter will be discussed.

Keywords: Solar Energetic Particles; Turbulence; Cosmic Rays; Solar Flares; Space Weather