Journal article
Suppression of Collisionless Magnetic Reconnection in the High Ion β, Strong Guide Field Limit
The Astrophysical journal, Vol.977(2), 218
12/01/2024
DOI: 10.3847/1538-4357/ad9274
Abstract
In magnetic reconnection, the ion bulk outflow speed and ion heating have been shown to be set by the available reconnecting magnetic energy, i.e., the energy stored in the reconnecting magnetic field (B- r ). However, recent simulations, observations, and theoretical works have shown that the released magnetic energy is inhibited by upstream ion plasma beta beta( i) -the relative ion thermal pressure normalized to magnetic pressure based on the reconnecting field-for antiparallel magnetic field configurations. Using kinetic theory and hybrid particle-in-cell simulations, we investigate the effects of beta( i) on guide field reconnection. While previous works have suggested that guide field reconnection is uninfluenced by beta( i) , we demonstrate that the reconnection process is modified and the outflow is reduced for sufficiently large beta(i)>(B-r(2)+B-g(2))/B-r(2) . We develop a theoretical framework that shows that this reduction is consistent with an enhanced exhaust pressure gradient, which reduces the outflow speed as v(out)proportional to 1/root beta(i) . These results apply to systems in which guide field reconnection is embedded in hot plasmas, such as reconnection at the boundary of eddies in fully developed turbulence like the solar wind or the magnetosheath as well as downstream of shocks such as the heliosheath or the mergers of galaxy clusters.
Details
- Title: Subtitle
- Suppression of Collisionless Magnetic Reconnection in the High Ion β, Strong Guide Field Limit
- Creators
- Carlos A. Giai - University of Hawaii SystemColby C. Haggerty - University of Hawaii SystemMichael A. Shay - University of DelawarePaul A. Cassak - West Virginia UniversityZachary K. Davis - University of Hawaii System
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.977(2), 218
- DOI
- 10.3847/1538-4357/ad9274
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- IOP Publishing Ltd
- Number of pages
- 9
- Grant note
- PHY-2205991; AGS-1936393 / National Science Foundation (NSF)https://doi.org/10.13039/100000001; National Science Foundation (NSF) AGS-2024198 / NASA; National Aeronautics & Space Administration (NASA) Purdue's ANVIL DE-SC0020294 / NSF-CAREER; National Science Foundation (NSF); NSF - Office of the Director (OD) PHY220089; AST180008 / NSF; National Science Foundation (NSF) AGS-2338131 / NSF/DOE; National Science Foundation (NSF); United States Department of Energy (DOE) 80NSSC24K0172 / DoE; United States Department of Energy (DOE)
- Language
- English
- Date published
- 12/01/2024
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9985224321202771
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