Test particle acceleration in a numerical MHD experiment of an anemone jet

TL;DR

This study uses 3D MHD simulations to analyze how magnetic reconnection in an anemone jet accelerates particles, revealing energy distributions and impact patterns that resemble solar flare observations.

Contribution

It introduces a novel numerical approach combining MHD simulations with particle tracing to study particle acceleration in anemone jets.

Findings

Particles reach energies exceeding solar flare observations.

Impact patterns reflect magnetic field topology.

Power-law energy distributions of particles and photons.

Abstract

To use a 3D numerical MHD experiment representing magnetic flux emerging into an open field region as a background field for tracing charged particles. The interaction between the two flux systems generates a localised current sheet where MHD reconnection takes place. We investigate how efficiently the reconnection region accelerates charged particles and what kind of energy distribution they acquire. The particle tracing is done numerically using the Guiding Center Approximation on individual data sets from the numerical MHD experiment. We derive particle and implied photon distribution functions having power law forms, and look at the impact patterns of particles hitting the photosphere. We find that particles reach energies far in excess of those seen in observations of solar flares. However the structure of the impact region in the photosphere gives a good representation of the topological structure of the magnetic field.