Combining MHD and kinetic modelling of solar flares

Mykola Gordovskyy, Philippa Browning

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    Abstract

    Solar flares are explosive events in the solar corona, representing fast conversion
    of magnetic energy into thermal and kinetic energy, and hence radiation, due to magnetic reconnection. Modelling is essential for understanding and predicting these events. However, self-consistent modelling is extremely difficult due to the vast spatial and temporal scale separation between processes involving thermal plasma (normally considered using magnetohydrodynamic (MHD) approach) and non-thermal plasma (requiring a kinetic approach). In this mini-review we consider different approaches aimed at bridging the gap between fluid and kinetic modelling of solar flares. Two types of approaches are discussed: combined MHD/test-particle (MHDTP) models, which can be used for modelling the flaring corona with relatively small numbers of energetic particles, and hybrid fluid-kinetic methods, which can be used for modelling stronger events with higher numbers of energetic particles. Two specific examples are discussed in more detail: MHDTP models of magnetic reconnection and particle acceleration in kink-unstable twisted coronal loops, and a novel reduced-kinetic model of particle transport.
    Original languageEnglish
    JournalAdvances in Space Research
    Early online date25 Sep 2018
    DOIs
    Publication statusPublished - 2018

    Research Beacons, Institutes and Platforms

    • Manchester Institute for Collaborative Research on Ageing

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