Abstract
Magnetic reconnection in a current sheet is commonly found in astrophysical plasma environments. If it is often bursty, releasing magnetic free energy explosively, in planetary magnetospheres, it instead displays a quasi-steady state in the solar wind, where the energy is dissipated via slow-mode shocks. The reason for this difference is elusive. Here we present a direct observation of bursty and turbulent magnetic reconnection in the solar wind, with its associated exhausts bounded by a pair of slow-mode shocks. We infer that the plasma is more efficiently heated in the magnetic reconnection diffusion region than across the shocks and that the flow enhancement is much higher in the exhausts than in the area around the diffusion region. We detected 75 other, similar diffusion-region events in solar wind data between October 2017 and May 2019, suggesting that bursty reconnection in the solar wind is more common than previously thought and actively contributes to solar wind acceleration and heating.
This is a preview of subscription content, access via your institution
Access options
Access Nature and 54 other Nature Portfolio journals
Get Nature+, our best-value online-access subscription
$29.99 / 30 days
cancel any time
Subscribe to this journal
Receive 12 digital issues and online access to articles
$119.00 per year
only $9.92 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
Data availability
All MMS data are available at https://lasp.colorado.edu/mms/sdc/public/.
Code availability
All the figures were made with the SPEDAS software (Space Physics Environment Data Analysis Software), downloaded from http://spedas.org/blog/.
References
Vasyliunas, V. M. Theoretical models of magnetic-field line merging. 1. Rev. Geophys. 13, 303–336 (1975).
Ji, H. T. et al. Magnetic reconnection in the era of exascale computing and multiscale experiments. Nat. Rev. Phys. 4, 263–282 (2022).
Lu, Q. M., Fu, H. S., Wang, R. S. & Lu, S. Collisionless magnetic reconnection in the magnetosphere. Chin. Phys. B. 31, 089401 (2022).
Burch, J. L. et al. Electron-scale measurements of magnetic reconnection in space. Science 352, aaf2939 (2016).
Wang, R. S. et al. Electron-scale quadrants of the hall magnetic field observed by the Magnetospheric Multiscale spacecraft during asymmetric reconnection. Phys. Rev. Lett. 118, 175101 (2017).
Torbert, R. B. et al. Electron-scale dynamics of the diffusion region during symmetric magnetic reconnection in space. Science 362, 1391–1395 (2018).
Wei, F. S., Hu, Q., Feng, X. S. & Fan, Q. L. Magnetic reconnection in interplanetary space. Space Sci. Rev. 107, 107–110 (2003).
Gosling, J. T., Skoug, R. M., McComas, D. J. & Smith, C. W. Direct evidence for magnetic reconnection in the solar wind near 1 au. J. Geophys. Res. Space Phys. 110, A01107 (2005).
Phan, T. D. et al. A magnetic reconnection X-line extending more than 390 Earth radii in the solar wind. Nature 439, 175–178 (2006).
Lavraud, B. et al. Observation of a complex solar wind reconnection exhaust from spacecraft separated by over 1,800 RE. Sol. Phys. 256, 379–392 (2009).
Mistry, R., Eastwood, J. P., Phan, T. D. & Hietala, H. Statistical properties of solar wind reconnection exhausts. J. Geophys. Res. Space Phys. 122, 5895–5909 (2017).
Phan, T. D. et al. Prevalence of magnetic reconnection in the near-Sun heliospheric current sheet. Astron. Astrophys. 650, A13 (2021).
Burch, J. L., Moore, T. E., Torbert, R. B. & Giles, B. L. Magnetospheric Multiscale overview and science objectives. Space Sci. Rev. 199, 5–21 (2016).
Pollock, C. et al. Fast Plasma Investigation for Magnetospheric Multiscale. Space Sci. Rev. 199, 331–406 (2016).
Russell, C. T. et al. The Magnetospheric Multiscale magnetometers. Space Sci. Rev. 199, 189–256 (2016).
Ergun, R. E. et al. The axial double probe and fields signal processing for the MMS Mission. Space Sci. Rev. 199, 167–188 (2016).
Lindqvist, P. A. et al. The spin-plane double probe electric field instrument for MMS. Space Sci. Rev. 199, 137–165 (2016).
Bandyopadhyay, R. et al. Solar wind turbulence studies using MMS Fast Plasma Investigation data. Astrophys. J. 866, 81 (2018).
Roberts, O. W. et al. A study of the solar wind ion and electron measurements from the Magnetospheric Multiscale Mission’s Fast Plasma Investigation. J. Geophys. Res. Space Phys. 126, e2021JA029784 (2021).
Forbes, T. G. The nature of Petschek-type reconnection. Earth Planets Space 53, 423–429 (2001).
Phan, T. D. et al. Parker Solar Probe in situ observations of magnetic reconnection exhausts during encounter 1. Astrophys. J. Suppl. Ser. 246, 34 (2020).
Eriksson, S. et al. Walen and slow-mode shock analyses in the near-Earth magnetotail in connection with a substorm onset on 27 August 2001. J. Geophys. Res. Space Phys. 109, A10212 (2004).
Sonnerup, B. U. O., Hasegawa, H., Denton, R. E. & Nakamura, T. K. M. Reconstruction of the electron diffusion region. J. Geophys. Res. Space Phys. 121, 4279–4290 (2016).
Shay, M. A., Drake, J. F., Denton, R. E. & Biskamp, D. Structure of the dissipation region during collisionless magnetic reconnection. J. Geophys. Res. Space Phys. 103, 9165–9176 (1998).
Wang, R. S. et al. An electron-scale current sheet without bursty reconnection signatures observed in the near-Earth tail. Geophys. Res. Lett. 45, 4542–4549 (2018).
Egedal, J. et al. Cluster observations of bidirectional beams caused by electron trapping during antiparallel reconnection. J. Geophys. Res. Space Phys. 115, A03214 (2010).
Zenitani, S., Hesse, M., Klimas, A., Black, C. & Kuznetsova, M. The inner structure of collisionless magnetic reconnection: the electron-frame dissipation measure and Hall fields. Phys. Plasmas 18, 122108 (2011).
Hesse, M., Aunai, N., Sibeck, D. & Birn, J. On the electron diffusion region in planar, asymmetric, systems. Geophys. Res. Lett. 41, 8673–8680 (2014).
Shay, M. A. et al. Kinetic signatures of the region surrounding the X line in asymmetric (magnetopause) reconnection. Geophys. Res. Lett. 43, 4145–4154 (2016).
Wang, R. et al. Coalescence of magnetic flux ropes in the ion diffusion region of magnetic reconnection. Nat. Phys. 12, 263–267 (2016).
Slavin, J. A. et al. Geotail observations of magnetic flux ropes in the plasma sheet. J. Geophys. Res. Space Phys. 108, 1015 (2003).
Wang, R. S. et al. Electrostatic and electromagnetic fluctuations detected inside magnetic flux ropes during magnetic reconnection. J. Geophys. Res. Space Phys. 121, 9473–9482 (2016).
Stawarz, J. E. et al. Intense electric fields and electron-scale substructure within magnetotail flux ropes as revealed by the Magnetospheric Multiscale Mission. Geophys. Res. Lett. 45, 8783–8792 (2018).
Moldwin, M. B., Ford, S., Lepping, R., Slavin, J. & Szabo, A. Small-scale magnetic flux ropes in the solar wind. Geophys. Res. Lett. 27, 57–60 (2000).
Cartwright, M. L. & Moldwin, M. B. Comparison of small-scale flux rope magnetic properties to large-scale magnetic clouds: evidence for reconnection across the HCS? J. Geophys. Res. Space Phys. 113, A09105 (2008).
Wu, D. J., Feng, H. Q. & Chao, J. K. Energy spectrum of interplanetary magnetic flux ropes and its connection with solar activity. Astron. Astrophys. 480, L9–L12 (2008).
Fermo, R. L., Drake, J. F. & Swisdak, M. Secondary magnetic islands generated by the Kelvin–Helmholtz instability in a reconnecting current sheet. Phys. Rev. Lett. 108, 255005 (2012).
Huang, C. et al. Development of turbulent magnetic reconnection in a magnetic island. Astrophys. J. 835, 245 (2017).
Chen, L. J. et al. Observation of energetic electrons within magnetic islands. Nat. Phys. 4, 19–23 (2008).
Telloni, D., Bruno, R., D’Amicis, R., Pietropaolo, E. & Carbone, V. Wavelet analysis as a tool to localize magnetic and cross-helicity events in the solar wind. Astrophys. J. 751, 19 (2012).
Zhao, L. L. et al. Detection of small magnetic flux ropes from the third and fourth Parker Solar Probe encounters. Astron. Astrophys. 650, A12 (2021).
Vörös, Z. et al. Magnetic reconnection within the boundary layer of a magnetic cloud in the solar wind. J. Geophys. Res. Space Phys. 126, e2021JA029415 (2021).
Li, X. M. et al. Three-dimensional network of filamentary currents and super-thermal electrons during magnetotail magnetic reconnection. Nat. Commun. 13, 3241 (2022).
Shay, M. A. et al. Electron heating during magnetic reconnection: a simulation scaling study. Phys. Plasmas 21, 122902 (2014).
Daughton, W. et al. Role of electron physics in the development of turbulent magnetic reconnection in collisionless plasmas. Nat. Phys. 7, 539–542 (2011).
Zank, G. P., le Roux, J. A., Webb, G. M., Dosch, A. & Khabarova, O. Particle acceleration via reconnection processes in the supersonic solar wind. Astrophys. J. 797, 28 (2014).
Drake, J. F., Swisdak, M., Schoeffler, K. M., Rogers, B. N. & Kobayashi, S. Formation of secondary islands during magnetic reconnection. Geophys. Res. Lett. 33, L13105 (2006).
Che, H. & Zank, G. P. Electron acceleration from expanding magnetic vortices during reconnection with a guide field. Astrophys. J. 889, 11 (2020).
Zhao, L. L. et al. An unusual energetic particle flux enhancement associated with solar wind magnetic island dynamics. Astrophys. J. Lett. 864, L34 (2018).
Zhao, L. L. et al. Particle acceleration at 5 au associated with turbulence and small-scale magnetic flux ropes. Astrophys. J. 872, 4 (2019).
Sonnerup, B. U. & Cahill, L. J. Magnetopause structure and attitude from Explorer 12 observations. J. Geophys. Res. 72, 171–183 (1967).
Sonnerup, B. U. O., Papamastorakis, I., Paschmann, G. & Luhr, H. Magnetopause properties from Ampte/Irm observations of the convection electric field: method development. J. Geophys. Res. Space Phys. 92, 12137–12159 (1987).
Matthaeus, W. H., Goldstein, M. L. & Smith, C. Evaluation of magnetic helicity in homogeneous turbulence. Phys. Rev. Lett. 48, 1256–1259 (1982).
Bruno, R. & Carbone, V. The solar wind as a turbulence laboratory. Living Rev. Sol. Phys. 10, 2 (2013).
Bruno, R. et al. The low-frequency break observed in the slow solar wind magnetic spectra. Astron. Astrophys. 627, A96 (2019).
Matthaeus, W. H. et al. Density and magnetic field signatures of interplanetary 1/f noise. Astrophys. J. 657, L121–L124 (2007).
Tu, C. Y. & Marsch, E. MHD structures, waves and turbulence in the solar-wind: observations and theories. Space Sci. Rev. 73, 1–210 (1995).
Acknowledgements
This work is supported by the B-type Strategic Priority Program of the Chinese Academy of Sciences (XDB41000000; R.W.), the National Science Foundation of China (NSFC) (grants 41922030 and 42174187; R.W.), the key research programme of frontier sciences CAS (QYZDJ-SSW-DQC010; Q.L.), the Fundamental Research Funds for the Central Universities (R.W.) and the China-Brazil Joint Laboratory for Space Weather and the NSSC/CAS (W.G.). R.W. thanks O. Roberts and R. Nakamura of the Space Research Institute of the Austrian Academy of Sciences for fruitful discussion.
Author information
Authors and Affiliations
Contributions
R.W. carried out the spacecraft data analysis and interpretation and wrote the manuscript. S.W. and X.L. dealt with part of the spacecraft data and took part in the discussion. Q.L. supervised the work and provided the theoretical analysis. X.L and S.L took part in the discussion and gave valuable suggestions. W.G. gave valuable suggestions and comments. All the authors discussed the results and commented on the paper.
Corresponding authors
Ethics declarations
Competing interests
The authors declare no competing interests.
Peer review
Peer review information
Nature Astronomy thanks Lingling Zhao, Rungployphan Kieokaew and Zoltan Vörös for their contribution to the peer review of this work.
Additional information
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Supplementary information
Supplementary Information
Supplementary Figs. 1–5 and Tables 1–3.
Rights and permissions
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
About this article
Cite this article
Wang, R., Wang, S., Lu, Q. et al. Direct observation of turbulent magnetic reconnection in the solar wind. Nat Astron 7, 18–28 (2023). https://doi.org/10.1038/s41550-022-01818-5
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1038/s41550-022-01818-5
This article is cited by
-
Observational evidence of accelerating electron holes and their effects on passing ions
Nature Communications (2023)
-
Recent progress on magnetic reconnection by in situ measurements
Reviews of Modern Plasma Physics (2023)