Energy transfer and electron energization in collisionless magnetic reconnection for different guide-field intensities

Pucci, Fulvia; Usami, Shunsuke; Ji, Hantao; Xiaohong, Guo; Horiuchi, Ritoku; Okamura, S.; Fox, W.; Jara-Almonte, Jonathan; Yoo, Jongsoo

doi:10.1063/1.5050992

Cited by 22 publications

(23 citation statements)

References 37 publications

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“…The peak dissipation occurs near the reconnection x point and over a current layer which extends approximately 1 s downstream from the x point in either direction. A similar trend toward dissipation dominated by J || E || during guide field reconnection has also been observed in recent statistical analysis of MMS events (Wilder et al, 2018), electron-scale reconnection events in turbulent plasmas , and recent particle simulations (Pucci et al, 2018).…”

Section: Mrx Observationssupporting

confidence: 81%

Energy Conversion by Parallel Electric Fields During Guide Field Reconnection in Scaled Laboratory and Space Experiments

Fox

Wilder

Eriksson

et al. 2018

Geophysical Research Letters

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We present direct and scaled comparisons between laboratory and in situ space observations of magnetic reconnection with a guide field, comparing results from the Magnetospheric Multiscale Mission and the Magnetic Reconnection eXperiment (MRX). While Magnetospheric Multiscale Mission observations obtain high‐resolution and fully kinetic data, MRX observations fully cover the 2‐D reconnection plane near the current sheet, removing uncertainties in situating the measurements compared to the reconnection region. Through scaling transformations, we show a quantitative agreement in magnetic field and current density profiles, which agree within a factor of 2 from each other. The introduction of the guide field causes the energy conversion J·E in the current sheet to be dominated by J||E|| in both cases. However, parallel electric fields reported by recent spacecraft crossings are significantly (5–10 times) larger than values obtained on MRX, highlighting an important issue for understanding energy conversion by reconnection.

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Section: Mrx Observationssupporting

confidence: 81%

Energy Conversion by Parallel Electric Fields During Guide Field Reconnection in Scaled Laboratory and Space Experiments

Fox

Wilder

Eriksson

et al. 2018

Geophysical Research Letters

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“…They observed the dissipation region adjusts to produce impulsive behaviour. Recent studies on energy transfer in different guide field configurations have been carried out with MRX, supported by Kinetic simulations (Fox et al 2018;Pucci et al 2018), as well as with the Spheromak merging experiments in Tokyo Tanabe et al (2019), and compared with observations from MMS (Eriksson et al 2016;Wilder et al 2017). In Yoo et al (2014) asymmetric (plasma density and magnetic field strength) current sheets have been reproduced with the MRX apparatus, confirming simulation studies (see, e.g., Pritchett 2008).…”

Section: Reconnection In Laboratory Plasmas: Mrx and Merging Spheromakssupporting

confidence: 62%

“…2018; Pucci et al. 2018), as well as with the Spheromak merging experiments in Tokyo Tanabe et al. (2019), and compared with observations from MMS (Eriksson et al.…”

Section: Understanding the Onset Problem: A Common Goal Of Astrophysimentioning

confidence: 99%

Onset of fast magnetic reconnection and particle energization in laboratory and space plasmas

et al. 2020

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The onset of magnetic reconnection in space, astrophysical and laboratory plasmas is reviewed discussing results from theory, numerical simulations and observations. After a brief introduction on magnetic reconnection and approach to the question of onset, we first discuss recent theoretical models and numerical simulations, followed by observations of reconnection and its effects in space and astrophysical plasmas from satellites and ground-based detectors, as well as measurements of reconnection in laboratory plasma experiments. Mechanisms allowing reconnection spanning from collisional resistivity to kinetic effects as well as partial ionization are described, providing a description valid over a wide range of plasma parameters, and therefore applicable in principle to many different astrophysical and laboratory environments. Finally, we summarize the implications of reconnection onset physics for plasma dynamics throughout the Universe and illustrate how capturing the dynamics correctly is important to understanding particle acceleration. The goal of this review is to give a view on the present status of this topic and future interesting investigations, offering a unified approach.

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“…Both driven simulations with open boundary conditions (Pucci et al. 2018a ) as well as periodic spontaneous reconnection simulations (Li et al. 2018 ) show a qualitative agreement with this result, confirming the transfer to be a characteristic feature of guide field reconnection.…”

Section: Similar Explosive Activity In Solar Corona and Other Physicamentioning

confidence: 54%

Explosive Magnetotail Activity

et al. 2019

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Modes and manifestations of the explosive activity in the Earth’s magnetotail, as well as its onset mechanisms and key pre-onset conditions are reviewed. Two mechanisms for the generation of the pre-onset current sheet are discussed, namely magnetic flux addition to the tail lobes, or other high-latitude perturbations, and magnetic flux evacuation from the near-Earth tail associated with dayside reconnection. Reconnection onset may require stretching and thinning of the sheet down to electron scales. It may also start in thicker sheets in regions with a tailward gradient of the equatorial magnetic field ; in this case it begins as an ideal-MHD instability followed by the generation of bursty bulk flows and dipolarization fronts. Indeed, remote sensing and global MHD modeling show the formation of tail regions with increased , prone to magnetic reconnection, ballooning/interchange and flapping instabilities. While interchange instability may also develop in such thicker sheets, it may grow more slowly compared to tearing and cause secondary reconnection locally in the dawn-dusk direction. Post-onset transients include bursty flows and dipolarization fronts, micro-instabilities of lower-hybrid-drift and whistler waves, as well as damped global flux tube oscillations in the near-Earth region. They convert the stretched tail magnetic field energy into bulk plasma acceleration and collisionless heating, excitation of a broad spectrum of plasma waves, and collisional dissipation in the ionosphere. Collisionless heating involves ion reflection from fronts, Fermi, betatron as well as other, non-adiabatic, mechanisms. Ionospheric manifestations of some of these magnetotail phenomena are discussed. Explosive plasma phenomena observed in the laboratory, the solar corona and solar wind are also discussed.

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Energy transfer and electron energization in collisionless magnetic reconnection for different guide-field intensities

Cited by 22 publications

References 37 publications

Energy Conversion by Parallel Electric Fields During Guide Field Reconnection in Scaled Laboratory and Space Experiments

Energy Conversion by Parallel Electric Fields During Guide Field Reconnection in Scaled Laboratory and Space Experiments

Onset of fast magnetic reconnection and particle energization in laboratory and space plasmas

Explosive Magnetotail Activity

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