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Magnetic tornadoes as energy channels into the solar corona



Heating the outer layers of the magnetically quiet solar atmosphere to more than one million kelvin and accelerating the solar wind requires an energy flux of approximately 100 to 300 watts per square metre1,2,3,4,5,6, but how this energy is transferred and dissipated there is a puzzle and several alternative solutions have been proposed. Braiding and twisting of magnetic field structures, which is caused by the convective flows at the solar surface, was suggested as an efficient mechanism for atmospheric heating7. Convectively driven vortex flows that harbour magnetic fields are observed8,9,10 to be abundant in the photosphere (the visible surface of the Sun). Recently, corresponding swirling motions have been discovered11 in the chromosphere, the atmospheric layer sandwiched between the photosphere and the corona. Here we report the imprints of these chromospheric swirls in the transition region and low corona, and identify them as observational signatures of rapidly rotating magnetic structures. These ubiquitous structures, which resemble super-tornadoes under solar conditions, reach from the convection zone into the upper solar atmosphere and provide an alternative mechanism for channelling energy from the lower into the upper solar atmosphere.

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Figure 1: Observation of a swirl event and its coronal counterpart.
Figure 2: Detected swirl events in the solar observations on 8 May 2011.
Figure 3: Numerical model of a swirl event produced with CO 5 BOLD.

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  1. Parker, E. Dynamical theory of the solar wind. Space Sci. Rev. 4, 666–708 (1965)

    Article  ADS  Google Scholar 

  2. Priest, E. et al. Nature of the heating mechanism for the diffuse solar corona. Nature 393, 545–547 (1998)

    Article  ADS  CAS  Google Scholar 

  3. Schrijver, C. et al. Large-scale coronal heating by the small-scale magnetic field of the Sun. Nature 394, 152–154 (1998)

    Article  ADS  CAS  Google Scholar 

  4. De Pontieu, B. et al. Chromospheric Alfvénic waves strong enough to power the solar wind. Science 318, 1574–1577 (2007)

    Article  ADS  CAS  Google Scholar 

  5. Cirtain, J. et al. Evidence for Alfvén waves in solar X-ray jets. Science 318, 1580–1582 (2007)

    Article  ADS  CAS  PubMed  Google Scholar 

  6. McIntosh, S. et al. Alfvénic waves with sufficient energy to power the quiet solar corona and fast solar wind. Nature 475, 477–480 (2011)

    Article  ADS  CAS  Google Scholar 

  7. Parker, E. Nanoflares and the solar X-ray corona. Astrophys. J. 330, 474–479 (1988)

    Article  ADS  Google Scholar 

  8. Brandt, P., Scharmer, G., Ferguson, S., Shine, R. & Tarbell, T. Vortex flow in the solar photosphere. Nature 335, 238–240 (1988)

    Article  ADS  Google Scholar 

  9. Bonet, J., Márquez, I., Sánchez Almeida, J., Cabello, I. & Domingo, V. Convectively driven vortex flows in the Sun. Astrophys. J. 687, L131–L134 (2008)

    Article  ADS  CAS  Google Scholar 

  10. Bonet, J. et al. SUNRISE/IMaX observations of convectively driven vortex flows in the Sun. Astrophys. J. 723, L139–L143 (2010)

    Article  ADS  Google Scholar 

  11. Wedemeyer-Böhm, S. & Rouppe van der Voort, L. Small-scale swirl events in the quiet Sun chromosphere. Astron. Astrophys. 507, L9–L12 (2009)

    Article  ADS  Google Scholar 

  12. Lemen, J. et al. The Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory (SDO). Sol. Phys. 275, 17–40 (2012)

    Article  ADS  Google Scholar 

  13. Tu, C.-Y. et al. Solar wind origin in coronal funnels. Science 308, 519–523 (2005)

    Article  ADS  CAS  PubMed  Google Scholar 

  14. Nordlund, Å. Solar convection. Sol. Phys. 100, 209–235 (1985)

    Article  ADS  Google Scholar 

  15. Bøhling, L., Andersen, A. & Fabre, D. Structure of a steady drain-hole vortex in a viscous fluid. J. Fluid Mech. 656, 177–188 (2010)

    Article  ADS  MathSciNet  Google Scholar 

  16. Stein, R. & Nordlund, Å. Simulations of solar granulation. I. General properties. Astrophys. J. 499, 914–933 (1998)

    Article  ADS  Google Scholar 

  17. Steiner, O. et al. Detection of vortex tubes in solar granulation from observations with SUNRISE. Astrophys. J. 723, L180–L184 (2010)

    Article  ADS  CAS  Google Scholar 

  18. Shelyag, S., Keys, P., Mathioudakis, M. & Keenan, F. Vorticity in the solar photosphere. Astron. Astrophys. 526, A5 (2011)

    Article  ADS  Google Scholar 

  19. Moll, R., Cameron, R. & Schüssler, M. Vortices in simulations of solar surface convection. Astron. Astrophys. 533, A126 (2011)

    Article  ADS  Google Scholar 

  20. Kitiashvili, I., Kosovichev, A., Mansour, N. & Wray, A. Excitation of acoustic waves by vortices in the quiet Sun. Astrophys. J. 727 L50. (2011)

  21. Freytag, B. et al. Simulations of stellar convection with CO5BOLD. J. Comput. Phys. 231, 919–959 (2012)

    Article  ADS  Google Scholar 

  22. Gudiksen, B. et al. The stellar atmosphere simulation code Bifrost. Code description and validation. Astron. Astrophys. 531, A154 (2011)

    Article  Google Scholar 

  23. Balmaceda, L., Vargas Domínguez, S., Palacios, J., Cabello, I. & Domingo, V. Evidence of small-scale magnetic concentrations dragged by vortex motion of solar photospheric plasma. Astron. Astrophys. 513, L6 (2010)

    Article  ADS  Google Scholar 

  24. Attie, R., Innes, D. & Potts, H. Evidence of photospheric vortex flows at supergranular junctions observed by FG/SOT (Hinode). Astron. Astrophys. 493, L13–L16 (2009)

    Article  ADS  CAS  Google Scholar 

  25. Zhang, J. & Liu, Y. Ubiquitous rotating network magnetic fields and extreme-ultraviolet cyclones in the quiet Sun. Astrophys. J. 741, L7 (2011)

    Article  ADS  Google Scholar 

  26. Jess, D. et al. Alfvén waves in the lower solar atmosphere. Science 323, 1582–1585 (2009)

    Article  ADS  CAS  PubMed  Google Scholar 

  27. Fedun, V., Shelyag, S., Verth, G., Mathioudakis, M. & Erdélyi, R. MHD waves generated by high-frequency photospheric vortex motions. Ann. Geophys. 29, 1029–1035 (2011)

    Article  ADS  Google Scholar 

  28. van Ballegooijen, A., Asgari-Targhi, M., Cranmer, S. & DeLuca, E. Heating of the solar chromosphere and corona by Alfvén wave turbulence. Astrophys. J. 736, 3 (2011)

    Article  ADS  Google Scholar 

  29. Cranmer, S., van Ballegooijen, A. & Edgar, R. Self-consistent coronal heating and solar wind acceleration from anisotropic magnetohydrodynamic turbulence. Astrophys. J. 171 (suppl.). 520–551 (2007)

    Article  ADS  CAS  Google Scholar 

  30. Clyne, J., Mininni, P., Norton, A. & Rast, M. Interactive desktop analysis of high resolution simulations: application to turbulent plume dynamics and current sheet formation. N. J. Phys. 9, 301 (2007)

    Article  Google Scholar 

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We acknowledge discussions with R. Hammer, M. Carlsson, V. Hansteen and S. McIntosh. M. Carlsson and B. Gudiksen are thanked for providing BIFROST simulation data and input on its analysis. This work was supported by the Research Council of Norway including computing time through the Programme for Supercomputing (Notur). R.E. acknowledges M. Kéray for encouragement and is also grateful to the NSF, Hungary. R.E. and V.F. also acknowledge the support received from the Science and Technology Facilities, UK. The Swedish 1-m Solar Telescope is operated on the island of La Palma by the Institute for Solar Physics of the Royal Swedish Academy of Sciences in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. We thank the Computational Information Systems Laboratory at the National Center for Atmospheric Research for providing the VAPOR analysis tool.

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Authors and Affiliations



S.W.-B. and E.S. produced and analysed the data with help from all authors. O.S., V.F. and R.E. gave advice on the data analysis, aspects of the physical interpretation and the applied numerical methods. J.d.l.C.R. and L.R.v.d.V. contributed to the collection and preparation of the observational data and its comparison with numerical data. All authors discussed the results and contributed to and commented on the manuscript.

Corresponding author

Correspondence to Sven Wedemeyer-Böhm.

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The authors declare no competing financial interests.

Supplementary information

Supplementary Information

This file contains Supplementary Table 1, which outlines the properties of all 14 swirls; Supplementary Figures 1-3, which illustrate the expansion of the magnetic field in a tornado into the solar corona, the comparison of an observed and a simulated swirl, and the related transport of energy; and Supplementary Notes which describe the derivations of the average Poynting flux. (PDF 8301 kb)

Supplementary Movie 1

This movie file shows a brief overview of the SST/CRISP (CRisp Imaging SpectroPolarimeter) data accumulated in this observational study of chromospheric swirls. The detection and properties (Doppler-shift structure and evolution to hotter channels as observed with the SDO) attributed to swirl #1 follows the overview. (MOV 4362 kb)

Supplementary Movie 2

This movie file shows the temporal evolution of all of the 14 swirls detected. Each swirl was recorded during a 55 min observing run on 8th May 2011. (MOV 18241 kb)

Supplementary Movie 3

This movie file outlines the results of a numerical simulation (CO5BOLD) of a solar magnetic tornado. The physical process describing the formation of the magnetic tornado is presented. The evolution of the flow field within the magnetic tornado through to the upper chromosphere is shown, thus, explaining its swirling nature. (MOV 21037 kb)

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Wedemeyer-Böhm, S., Scullion, E., Steiner, O. et al. Magnetic tornadoes as energy channels into the solar corona. Nature 486, 505–508 (2012).

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