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Numerical Modeling of Energetic Electron Acceleration, Transport, and Emission in Solar Flares: Connecting Loop-top and Footpoint Hard X-Ray Sources
Numerical Modeling of Energetic Electron Acceleration, Transport, and Emission in Solar Flares: Connecting Loop-top and Footpoint Hard X-Ray Sources by Xiangliang Kong et al. on Wednesday 30 November
The acceleration and transport of energetic electrons during solar flares is
one of the outstanding topics in solar physics. Recent X-ray and radio imaging
and spectroscopy observations have provided diagnostics of the distribution of
nonthermal electrons and suggested that, in certain flare events, electrons are
primarily accelerated in the loop-top and likely experience trapping and/or
scattering effects. By combining the focused particle transport equation with
magnetohydrodynamic (MHD) simulations of solar flares, we present a macroscopic
particle model that naturally incorporates electron acceleration and transport.
Our simulation results indicate that the physical processes such as turbulent
pitch-angle scattering can have important impacts on both electron acceleration
in the loop-top and transport in the flare loop, and their influences are
highly energy dependent. A spatial-dependent turbulent scattering with
enhancement in the loop-top can enable both efficient electron acceleration to
high energies and transport of abundant electrons to the footpoints. We further
generate spatially resolved synthetic hard X-ray (HXR) emission images and
spectra, revealing both the loop-top and footpoint HXR sources. Similar to the
observations, we show that the footpoint HXR sources are brighter and harder
than the loop-top HXR source. We suggest that the macroscopic particle model
provides new insights into understanding the connection between the observed
loop-top and footpoint nonthermal emission sources by combining the particle
model with dynamically evolving MHD simulations of solar flares.
arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.15333v1
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By Corentin CadiouNumerical Modeling of Energetic Electron Acceleration, Transport, and Emission in Solar Flares: Connecting Loop-top and Footpoint Hard X-Ray Sources by Xiangliang Kong et al. on Wednesday 30 November
The acceleration and transport of energetic electrons during solar flares is
one of the outstanding topics in solar physics. Recent X-ray and radio imaging
and spectroscopy observations have provided diagnostics of the distribution of
nonthermal electrons and suggested that, in certain flare events, electrons are
primarily accelerated in the loop-top and likely experience trapping and/or
scattering effects. By combining the focused particle transport equation with
magnetohydrodynamic (MHD) simulations of solar flares, we present a macroscopic
particle model that naturally incorporates electron acceleration and transport.
Our simulation results indicate that the physical processes such as turbulent
pitch-angle scattering can have important impacts on both electron acceleration
in the loop-top and transport in the flare loop, and their influences are
highly energy dependent. A spatial-dependent turbulent scattering with
enhancement in the loop-top can enable both efficient electron acceleration to
high energies and transport of abundant electrons to the footpoints. We further
generate spatially resolved synthetic hard X-ray (HXR) emission images and
spectra, revealing both the loop-top and footpoint HXR sources. Similar to the
observations, we show that the footpoint HXR sources are brighter and harder
than the loop-top HXR source. We suggest that the macroscopic particle model
provides new insights into understanding the connection between the observed
loop-top and footpoint nonthermal emission sources by combining the particle
model with dynamically evolving MHD simulations of solar flares.
arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.15333v1