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Title: Particle acceleration during magnetic reconnection in a low-beta pair plasma

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4948284· OSTI ID:1338803
 [1];  [1];  [1];  [2];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Alabama in Huntsville, Huntsville, AL (United States)
  3. NASA Goddard Space Flight Center, Greenbelt, MD (United States)

Plasma energization through magnetic reconnection in the magnetically dominated regime featured by low plasma beta (β=8πnkT0/B2 <<1) and/or high magnetization (σ=B2/(4πnmc2)>>1) is important in a series of astrophysical systems such as solar flares, pulsar wind nebula, and relativistic jets from black holes. In this paper, we review the recent progress on kinetic simulations of this process and further discuss plasma dynamics and particle acceleration in a low-β reconnection layer that consists of electron–positron pairs. We also examine the effect of different initial thermal temperatures on the resulting particle energy spectra. While earlier papers have concluded that the spectral index is smaller for higher σ, our simulations show that the spectral index approaches p = 1 for sufficiently low plasma β, even if σ~1. Since this predicted spectral index in the idealized limit is harder than most observations, it is important to consider effects that can lead to a softer spectrum such as open boundary simulations. Here, we also remark that the effects of three-dimensional reconnection physics and turbulence on reconnection need to be addressed in the future.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1338803
Alternate ID(s):
OSTI ID: 1420672
Report Number(s):
LA-UR-16-21885
Journal Information:
Physics of Plasmas, Vol. 23, Issue 5; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (12)

Slab magnetised non-relativistic low-beta electron–positron plasmas: collisionless heating, linear waves and reconnecting instabilities journal December 2017
Relativistic magnetic reconnection driven by a laser interacting with a micro-scale plasma slab journal April 2018
The steady growth of the high-energy spectral cut-off in relativistic magnetic reconnection journal October 2018
Numerical study of the cascading energy conversion of the reconnection current sheet in solar eruptions journal October 2018
Physics of the saturation of particle acceleration in relativistic magnetic reconnection journal February 2018
MHD Instabilities in Accretion Disks and Their Implications in Driving Fast Magnetic Reconnection journal August 2018
Very-high-energy Emission from Magnetic Reconnection in the Radiative-inefficient Accretion Flow of SgrA* journal June 2019
Relativistic Magnetic Reconnection in Electron–Positron–Proton Plasmas: Implications for Jets of Active Galactic Nuclei journal July 2019
Current Sheets, Magnetic Islands, and Associated Particle Acceleration in the Solar Wind as Observed by Ulysses near the Ecliptic Plane journal August 2019
Physics of the saturation of particle acceleration in relativistic magnetic reconnection text January 2017
MHD instabilities in accretion disks and their implications in driving fast magnetic reconnection text January 2018
Relativistic Magnetic Reconnection in Electron-Positron-Proton Plasmas: Implications for Jets of Active Galactic Nuclei text January 2019