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Effects of Coronal Magnetic Field Configuration on Particle Acceleration and Release during the Ground Level Enhancement Events in Solar Cycle 24
Wenlong Liu, Xiangliang Kong, Fan Guo +6
Ground level enhancements (GLEs) are extreme solar energetic particle (SEP) events that are of particular importance in space weather. In solar cycle 24, two GLEs were recorded on…
Particle acceleration in solar flares with imaging-spectroscopy in soft X-rays
Mitsuo Oka, Amir Caspi, Bin Chen +15
Particles are accelerated to very high, non-thermal energies during explosive energy-release phenomena in space, solar, and astrophysical plasma environments. In the case of solar…
Numerical Modeling of Energetic Electron Acceleration, Transport, and Emission in Solar Flares: Connecting Loop-top and Footpoint Hard X-Ray Sources
Xiangliang Kong, Bin Chen, Fan Guo +8
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 observa…
Solar Energetic Particle Acceleration at a Spherical Shock with the Shock Normal Angle Evolving in Space and Time
Xiaohang Chen, Joe Giacalone, Fan Guo
We present a 2D kinematic model to study the acceleration of solar energetic particles (SEPs) at a shock driven by a coronal mass ejection. The shock is assumed to be spherical abo…
Particle Acceleration in Magnetic Reconnection with Ad hoc Pitch-angle Scattering
Grant Johnson, Patrick Kilian, Fan Guo +1
Particle acceleration during magnetic reconnection is a long-standing topic in space, solar and astrophysical plasmas. Recent 3D particle-in-cell simulations of magnetic reconnecti…
Modeling Electron Acceleration and Transport in the Early Impulsive Phase of the 2017 September 10 Solar Flare
Xiaocan Li, Fan Guo, Bin Chen +2
The X8.2-class limb flare on September 10, 2017 is among the best studied solar flare events owing to its great similarity to the standard flare model and the broad coverage by mul…
Double-power-law feature of energetic particles accelerated at coronal shocks
Feiyu Yu, Xiangliang Kong, Fan Guo +4
Recent observations have shown that in many large solar energetic particle (SEP) events the event-integrated differential spectra resemble double power laws. We perform numerical m…
A model of double coronal hard X-ray sources in solar flares
Xiangliang Kong, Jing Ye, Bin Chen +6
A number of double coronal X-ray sources have been observed during solar flares by RHESSI, where the two sources reside at different sides of the inferred reconnection site. Howeve…
Variable Ion Compositions of Solar Energetic Particle Events in the Inner Heliosphere: A Field-line Braiding Model with Compound Injections
Fan Guo, Lulu Zhao, Christina M. S. Cohen +8
We propose a model for interpreting highly variable ion composition ratios in solar energetic particles (SEP) events recently observed by Parker Solar Probe (PSP) at a…
Role of Parallel Solenoidal Electric Field on Energy Conversion in 2.5D Decaying Turbulence with a Guide Magnetic Field
Peera Pongkitiwanichakul, David Ruffolo, Fan Guo +5
We perform 2.5D particle-in-cell simulations of decaying turbulence in the presence of a guide (out-of-plane) background magnetic field. The fluctuating magnetic field initially co…
Efficient Nonthermal Ion and Electron Acceleration Enabled by the Flux-Rope Kink Instability in 3D Nonrelativistic Magnetic Reconnection
Qile Zhang, Fan Guo, William Daughton +2
The relaxation of field-line tension during magnetic reconnection gives rise to a universal Fermi acceleration process involving the curvature drift of particles. However, the effi…
Shock Propagation and Associated Particle Acceleration in the Presence of Ambient Solar-Wind Turbulence
Fan Guo, Joe Giacalone, Lulu Zhao
The topic of this review paper is on the influence of solar wind turbulence on shock propagation and its consequence on the acceleration and transport of energetic particles at sho…
Fast Magnetic Reconnection with Turbulence in High Lundquist Number Limit
Yang Liping, Li Hui, Guo Fan +5
We use extensive 3D resistive MHD simulations to study how large-scale current sheets will undergo fast reconnection in the high Lundquist number limit (above ), whe…
Measurement of magnetic field and relativistic electrons along a solar flare current sheet
Bin Chen, Chengcai Shen, Dale E. Gary +8
In the standard model of solar flares, a large-scale reconnection current sheet is postulated as the central engine for powering the flare energy release and accelerating particles…
Formation of Power-law Electron Energy Spectra in Three-dimensional Low- Magnetic Reconnection
Xiaocan Li, Fan Guo, Hui Li +2
While observations have suggested that power-law electron energy spectra are a common outcome of strong energy release during magnetic reconnection, e.g., in solar flares, kinetic…
The Acceleration of Energetic Particles at Coronal Shocks and Emergence of a Double Power Law Feature in Particle Energy Spectra
Xiangliang Kong, Fan Guo, Yao Chen +1
We present numerical modelling of particle acceleration at coronal shocks propagating through a streamer-like magnetic field by solving the Parker transport equation with spatial d…
Astro2020 Science White Paper: Probing Magnetic Reconnection in Solar Flares - New Perspectives from Radio Dynamic Imaging Spectroscopy
Bin Chen, Tim Bastian, Joel Dahlin +9
Magnetic reconnection is a fundamental physical process in many laboratory, space, and astrophysical plasma contexts. Solar flares serve as an outstanding laboratory to study the m…
The Dynamical Behavior of Reconnection-driven Termination Shocks in Solar Flares: Magnetohydrodynamic Simulations
Chengcai Shen, Xiangliang Kong, Fan Guo +2
In eruptive solar flares, termination shocks (TSs), formed when high-speed reconnection outflows collide with closed dense flaring loops, are believed to be one of the possible can…
Plasma Energization in Colliding Magnetic Flux Ropes
Senbei Du, Fan Guo, Gary P. Zank +2
Magnetic flux ropes are commonly observed throughout the heliosphere, and recent studies suggest that interacting flux ropes are associated with some energetic particle events. In…
Magnetic Reconnection Null Points as the Origin of Semi-relativistic Electron Beams in a Solar Jet
Bin Chen, Sijie Yu, Marina Battaglia +7
Magnetic reconnection, the central engine that powers explosive phenomena throughout the Universe, is also perceived as one of the principal mechanisms for accelerating particles t…
Large-scale Compression Acceleration during Magnetic Reconnection in a Low- Plasma
Xiaocan Li, Fan Guo, Hui Li +1
In solar flares and other astrophysical systems, a major challenge for solving particle acceleration problem associated with magnetic reconnection is the enormous scale separation…
The acceleration of high-energy protons at coronal shocks: the effect of large-scale streamer-like magnetic field structures
Xiangliang Kong, Fan Guo, Joe Giacalone +2
Recent observations have shown that coronal shocks driven by coronal mass ejections can develop and accelerate particles within several solar radii in large solar energetic particl…
Observation of a Metric Type N Solar Radio Burst
Xiangliang Kong, Yao Chen, Shiwei Feng +7
Type III and type-III-like radio bursts are produced by energetic electron beams guided along coronal magnetic fields. As a variant of type III bursts, Type N bursts appear as the…
Electron Acceleration at a Coronal Shock Propagating Through a Large-scale Streamer-like Magnetic Field
Xiangliang Kong, Yao Chen, Fan Guo +3
With a test-particle simulation, we investigate the effect of large-scale coronal magnetic fields on electron acceleration at an outward-propagating coronal shock with a circular f…