The role of three-dimensional transport in driving enhanced electron acceleration during magnetic reconnection
Abstract
Magnetic reconnection is an important driver of energetic particles in many astrophysical phenomena. Using kinetic particle-in-cell simulations, we explore the impact of three-dimensional reconnection dynamics on the efficiency of particle acceleration. In two-dimensional systems, Alfvénic outflows expel energetic electrons into flux ropes where they become trapped and disconnected from acceleration regions. However, in three-dimensional systems these flux ropes develop an axial structure that enables particles to leak out and return to acceleration regions. This requires a finite guide field so that particles may move quickly along the flux rope axis. We show that greatest energetic electron production occurs when the guide field is of the same order as the reconnecting component: large enough to facilitate strong transport, but not so large as to throttle the dominant Fermi mechanism responsible for efficient electron acceleration. This suggests a natural explanation for the envelope of electron acceleration during the impulsive phase of eruptive flares.
- Authors:
-
- Univ. of Maryland, College Park, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. Corporation for Atmospheric Research, Boulder, CO (United States)
- Univ. of Maryland, College Park, MD (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE; National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
- OSTI Identifier:
- 1497847
- Grant/Contract Number:
- AGS1202330; PHY1102479; NNX11AQ93H; APL-975268; NNX08AV87G; NAS 5-98033
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 24; Journal Issue: 9; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Dahlin, J. T., Drake, J. F., and Swisdak, M. The role of three-dimensional transport in driving enhanced electron acceleration during magnetic reconnection. United States: N. p., 2017.
Web. doi:10.1063/1.4986211.
Dahlin, J. T., Drake, J. F., & Swisdak, M. The role of three-dimensional transport in driving enhanced electron acceleration during magnetic reconnection. United States. https://doi.org/10.1063/1.4986211
Dahlin, J. T., Drake, J. F., and Swisdak, M. Tue .
"The role of three-dimensional transport in driving enhanced electron acceleration during magnetic reconnection". United States. https://doi.org/10.1063/1.4986211. https://www.osti.gov/servlets/purl/1497847.
@article{osti_1497847,
title = {The role of three-dimensional transport in driving enhanced electron acceleration during magnetic reconnection},
author = {Dahlin, J. T. and Drake, J. F. and Swisdak, M.},
abstractNote = {Magnetic reconnection is an important driver of energetic particles in many astrophysical phenomena. Using kinetic particle-in-cell simulations, we explore the impact of three-dimensional reconnection dynamics on the efficiency of particle acceleration. In two-dimensional systems, Alfvénic outflows expel energetic electrons into flux ropes where they become trapped and disconnected from acceleration regions. However, in three-dimensional systems these flux ropes develop an axial structure that enables particles to leak out and return to acceleration regions. This requires a finite guide field so that particles may move quickly along the flux rope axis. We show that greatest energetic electron production occurs when the guide field is of the same order as the reconnecting component: large enough to facilitate strong transport, but not so large as to throttle the dominant Fermi mechanism responsible for efficient electron acceleration. This suggests a natural explanation for the envelope of electron acceleration during the impulsive phase of eruptive flares.},
doi = {10.1063/1.4986211},
journal = {Physics of Plasmas},
number = 9,
volume = 24,
place = {United States},
year = {Tue Sep 05 00:00:00 EDT 2017},
month = {Tue Sep 05 00:00:00 EDT 2017}
}
Web of Science
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