Electron acceleration from contracting magnetic islands during reconnection (2024)

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Abstract Access options Additional access options: Similar content being viewed by others First-principles theory of the rate of magnetic reconnection in magnetospheric and solar plasmas Local heating of radiation belt electrons to ultra-relativistic energies Three-dimensional network of filamentary currents and super-thermal electrons during magnetotail magnetic reconnection References Acknowledgements Author information Authors and Affiliations Corresponding author Ethics declarations Competing interests Supplementary information Supplementary Notes Rights and permissions About this article Cite this article This article is cited by Circular-ribbon flares and the related activities Turbulent magnetic reconnection generated by intense lasers Recent progress on magnetic reconnection by in situ measurements Non-thermal electron acceleration from magnetically driven reconnection in a laboratory plasma Future Exploration of the Outer Heliosphere and Very Local Interstellar Medium by Interstellar Probe Comments
  • Letter
  • Published:
  • J. F. Drake1,
  • M. Swisdak2,
  • H. Che1 &
  • …
  • M. A. Shay3

Nature volume443,pages 553–556 (2006)Cite this article

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Abstract

A long-standing problem in the study of space and astrophysical plasmas is to explain the production of energetic electrons as magnetic fields ‘reconnect’ and release energy. In the Earth's magnetosphere, electron energies reach hundreds of thousands of electron volts (refs 1–3), whereas the typical electron energies associated with large-scale reconnection-driven flows are just a few electron volts. Recent observations further suggest that these energetic particles are produced in the region where the magnetic field reconnects4. In solar flares, upwards of 50 per cent of the energy released can appear as energetic electrons5,6. Here we show that electrons gain kinetic energy by reflecting from the ends of the contracting ‘magnetic islands’ that form as reconnection proceeds. The mechanism is analogous to the increase of energy of a ball reflecting between two converging walls—the ball gains energy with each bounce. The repetitive interaction of electrons with many islands allows large numbers to be efficiently accelerated to high energy. The back pressure of the energetic electrons throttles reconnection so that the electron energy gain is a large fraction of the released magnetic energy. The resultant energy spectra of electrons take the form of power laws with spectral indices that match the magnetospheric observations.

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Similar content being viewed by others

Electron acceleration from contracting magnetic islands during reconnection (5)

First-principles theory of the rate of magnetic reconnection in magnetospheric and solar plasmas

Article Open access 28 April 2022

Electron acceleration from contracting magnetic islands during reconnection (6)

Local heating of radiation belt electrons to ultra-relativistic energies

Article Open access 10 September 2020

Electron acceleration from contracting magnetic islands during reconnection (7)

Three-dimensional network of filamentary currents and super-thermal electrons during magnetotail magnetic reconnection

Article Open access 10 June 2022

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Acknowledgements

This work was supported by the NSF/DOE programme in plasma science, by NASA through the Supporting Research and Technology and the Sun-Earth Connections Theory programmes, through CMPD, a DOE FSC, and through CISM, an NSF STC. Computations were carried out in part at the National Energy Research Scientific Computing Center. Author Contributions J.F.D., M.S. and M.A.S. identified the Fermi mechanism; J.F.D. carried out the particle simulations of reconnection, obtained the solutions of the transport equation and wrote the paper; and M.S. and H.C. carried out the bubble and test particle simulations, respectively. All of the authors discussed the results and commented on the paper.

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Authors and Affiliations

  1. University of Maryland, College Park, Maryland, 20742, USA

    J. F. Drake&H. Che

  2. Plasma Physics Division, Naval Research Laboratory, DC 20375, Washington, USA

    M. Swisdak

  3. University of Delaware, Newark, Delaware, 19716, USA

    M. A. Shay

Authors

  1. J. F. Drake

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  2. M. Swisdak

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Correspondence to J. F. Drake.

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Reprints and permissions information is available at www.nature.com/reprints. The authors declare no competing financial interests.

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Supplementary Notes

Derivation of the powerlaw spectrum. The notes outline the derivation the solution of the particle transport equation in the limit in which the back-pressure from energetic particles can be neglected. The resulting solution in Eq. (4) of the paper takes the form of a power-law at high energy. (PDF 38 kb)

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Drake, J., Swisdak, M., Che, H. et al. Electron acceleration from contracting magnetic islands during reconnection. Nature 443, 553–556 (2006). https://doi.org/10.1038/nature05116

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Electron acceleration from contracting magnetic islands during reconnection (2024)
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