Large-scale Compression Acceleration during Magnetic Reconnection in a Low- β Plasma

Li, Xiaocan; Guo, Fan; Li, Hui; Li, Shengtai

doi:10.3847/1538-4357/aae07b

Title: Large-scale Compression Acceleration during Magnetic Reconnection in a Low- β Plasma

Journal Article · Fri Oct 05 00:00:00 EDT 2018 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aae07b· OSTI ID:1489962

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); New Mexico Consortium, Los Alamos, NM (United States)

In solar flares and other astrophysical systems, a major challenge for solving the particle acceleration problem associated with magnetic reconnection is the enormous scale separation between kinetic scales and the observed reconnection scale. Because of this, it has been difficult to draw any definite conclusions by just using kinetic simulations. A particle acceleration model that solves the energetic particle transport equation can capture the main acceleration physics found in kinetic simulations and thus provide a practical way to make observable predictions and directly compare model results with observations. Here we study compression particle acceleration in magnetic reconnection by solving the Parker (diffusion–advection) transport equation using velocity and magnetic fields from two-dimensional magnetohydrodynamics (MHD) simulations of a low-β high-Lundquist-number reconnection layer. We show that the compressible reconnection layer can give significant particle acceleration, leading to the formation of power-law particle energy distributions. We analyze the acceleration rate and find that the acceleration in the reconnection layer is a mixture of first- and second-order Fermi processes. When including a guide field, we find that the spectrum becomes steeper and both the power-law cutoff energy and maximum particle energy decrease as plasma becomes less compressible. This model produces a 2D particle distribution that one can use to generate a radiation map and directly compare with solar flare observations. This provides a framework to explain particle acceleration at large-scale astrophysical reconnection sites, such as solar flares.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)

Grant/Contract Number:: 89233218CNA000001; SC0018240

OSTI ID:: 1489962

Report Number(s):: LA-UR-18-26786

Journal Information:: The Astrophysical Journal (Online), Vol. 866, Issue 1; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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Current Sheets, Magnetic Islands, and Associated Particle Acceleration in the Solar Wind as Observed by Ulysses near the Ecliptic Plane Malandraki, Olga; Khabarova, Olga; Bruno, Roberto The Astrophysical Journal, Vol. 881, Issue 2 https://doi.org/10.3847/1538-4357/ab289a	journal	August 2019
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Super-efficient Electron Acceleration by an Isolated Magnetic Reconnection Fu, H. S.; Xu, Y.; Vaivads, A. The Astrophysical Journal, Vol. 870, Issue 2 https://doi.org/10.3847/2041-8213/aafa75	journal	January 2019
Formation of Power-law Electron Energy Spectra in Three-dimensional Low- β Magnetic Reconnection Li, Xiaocan; Guo, Fan; Li, Hui The Astrophysical Journal, Vol. 884, Issue 2 https://doi.org/10.3847/1538-4357/ab4268	journal	October 2019
Particle acceleration in kinetic simulations of non-relativistic magnetic reconnection with different ion-electron mass ratio Li, Xiaocan; Guo, Fan; Li, Hui arXiv https://doi.org/10.48550/arxiv.1905.08797	text	January 2019
Large-Scale Parallel Electric Fields and Return Currents in a Global Simulation Model Arnold, Harry; Drake, James; Swisdak, Marc arXiv https://doi.org/10.48550/arxiv.1907.07554	text	January 2019
The Acceleration of Energetic Particles at Coronal Shocks and Emergence of a Double Power Law Feature in Particle Energy Spectra Kong, Xiangliang; Guo, Fan; Chen, Yao arXiv https://doi.org/10.48550/arxiv.1907.13321	text	January 2019

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