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Plasmoids in Solar Flares and Their Radio and X-ray Signatures

  • Marian Karlický
  • Miroslav Bárta
Conference paper
Part of the Astrophysics and Space Science Proceedings book series (ASSSP, volume 33)

Abstract

This review summarizes our recent results connected with the theoretical and observational aspects of plasmoids in solar flares. We show that the plasmoids play a very important role in the primary flare process – in the magnetic field reconnection. It is shown how the plasmoids are formed, how they move and interact, and how the flare current sheet is fragmented due to these processes. Furthermore, we present a successive merging of the plasmoids, which not only very efficiently accelerate particles, but also it can produce large plasmoids which are sometimes observed in the X-ray emission. Considering the plasmoids the radio drifting pulsating structures (DPSs), narrowband dm-spikes and the above-the-loop-top hard X-ray sources are interpreted. Some interesting radio spectra, relevant to this topic, are added.

Keywords

Current Sheet Solar Flare Energetic Electron Fast Reconnection Magnetic Rope 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This research was supported by the grants P209/12/0103, P209/10/1680 (GA CR), and the research project AV0Z10030501 of the Astronomical Institute AS.

References

  1. 1.
    Ohyama, M., Shibata, K.: X-ray plasma ejection associated with an impulsive flare on 1992 October 5: Physical conditions of X-ray plasma ejection. Astrophys. J. 499, 934–944 (1998)Google Scholar
  2. 2.
    Kliem, B., Karlický, M., Benz, A.O.: Solar flare radio pulsations as a signature of dynamic magnetic reconnection. Astron. Astrophys. 360, 715–728 (2000)Google Scholar
  3. 3.
    Khan, J.I., Vilmer, N., Saint-Hilaire, P., Benz, A.O.: The solar coronal origin of a slowly drifting decimetric-metric pulsation structure. Astron. Astrophys. 388, 363–372 (2002)Google Scholar
  4. 4.
    Karlický, M., Fárník, F., Mészárosová, H.: High-frequency slowly drifting structures in solar flares. Astron. Astrophys. 395, 677–683 (2002)Google Scholar
  5. 5.
    Karlický, M.: Series of high-frequency slowly drifting structures mapping the flare magnetic field reconnection. Astron. Astrophys. 417, 325–332 (2004)Google Scholar
  6. 6.
    Karlický, M., Bárta, M.: Drifting pulsating structures generated during tearing and coalescence processes in a flare current sheet. Astron. Astrophys. 464, 735–740 (2007)Google Scholar
  7. 7.
    Bárta, M., Karlický, M., Žemlička, R.: Plasmoid dynamics in flare reconnection and the frequency drift of the drifting pulsating structure. Solar Phys. 253, 173–189 (2008)Google Scholar
  8. 8.
    Karlický, M., Bárta, M., Rybák, J.: Radio spectra generated during coalescence processes of plasmoids in a flare current sheet. Astron. Astrophys. 514, id.A28 (2010)Google Scholar
  9. 9.
    Drake, J.F., Shay, M.A., Thongthai, W., Swisdak, M.: Production of energetic electrons during magnetic reconnection. Phys. Rev. Letters 94, id.095001 (2005)Google Scholar
  10. 10.
    Drake, J.F., Swisdak, M., Che, H., Shay, M. A.: Electron acceleration from contracting magnetic islands during reconnection. Nature 443, 553–556 (2006)Google Scholar
  11. 11.
    Hoshino, M.: Electron surfing acceleration in magnetic reconnection. J. Geophys. Res. 110, id. A10215 (2005)Google Scholar
  12. 12.
    Pritchett, P.L.: Relativistic electron production during guide field magnetic reconnection. J. Geophys. Res. 111, id.A10212 (2006)Google Scholar
  13. 13.
    Pritchett, P.L.: Energetic electron acceleration during multi-island coalescence. Phys. Plasmas 15, 102105-102105-9 (2008)Google Scholar
  14. 14.
    Karlický, M.: Separation of accelerated electrons and positrons in the relativistic reconnection. Astrophys. J. 674, 1211–1216 (2008)Google Scholar
  15. 15.
    Bárta, M., Vršnak, B., Karlický, M.: Dynamics of plasmoids formed by the current sheet tearing, Astron. Astrophys. 477, 649–655 (2008)Google Scholar
  16. 16.
    Kolomanski, S., Karlický, M.: The interaction of a plasmoid with a loop-top kernel. Astron. Astrophys. 475, 685–693 (2007)Google Scholar
  17. 17.
    Milligan, R.O., McAteer, R.T.J., Dennis, B.R., Young, C.A.: Evidence of a plasmoid-looptop interaction and magnetic inflows during a solar flare/coronal mass ejection eruptive event. Astrophys. J. 713, 1292–1300 (2010)Google Scholar
  18. 18.
    Shibata, K., Tanuma, S.: Plasmoid-induced-reconnection and fractal reconnection. Earth Planets Space 53, 473–482 (2001)Google Scholar
  19. 19.
    Bárta, M., Büchner, J., Karlický, M.: Multi-scale MHD approach to the current sheet filamentation in solar coronal reconnection. Adv. Space Res. 45, 10–17 (2010)Google Scholar
  20. 20.
    Bárta, M., Büchner, J., Karlický, M., Skála, J.: Spontaneous Current-layer Fragmentation and Cascading Reconnection in Solar Flares. I. Model and Analysis. Astrophys. J. 737, id. 24 (2011)Google Scholar
  21. 21.
    Bárta, M., Büchner, J., Karlický, M., Kotrč, P.: Spontaneous current-layer fragmentation and cascading reconnection in solar flares. II. Relation to observations. Astrophys. J. 730, id.47 (2011)Google Scholar
  22. 22.
    Loureiro, N.F., Schekochihin, A.A., Cowley, S.C.: Instability of current sheets and formation of plasmoid chains. Physics of Plasmas 14, 100703–100703-4 (2007)Google Scholar
  23. 23.
    Uzdensky, D.A., Loureiro, N.F., Schekochihin, A.A.: Fast magnetic reconnection in the plasmoid-dominated regime. Physical Review Letters 105, 235002–235002-4 (2010)Google Scholar
  24. 24.
    Hoshino, M., Nishida, A., Yamamoto, T., Kokubun, S.: Turbulent magnetic field in the distant magnetotail: Bottom-up process of plasmoid formation? Geophys. Res. Lett. 21, 2935–2938 (1994)Google Scholar
  25. 25.
    Saito, S., Sakai, J.I.: The emission of electromagnetic waves during the coalescence of two parallel current loops in solar flares. Astrophys. J. 616, L179–L182 (2004)Google Scholar
  26. 26.
    Karlický, M., Bárta, M.: Successive merging of plasmoids and fragmentation in a flare current sheet and their X-ray and radio signatures. Astrophys. J. 733, id.107 (2011)Google Scholar
  27. 27.
    Masuda, S., Kosugi, T., Hara, H., Tsuneta, S., Ogawara, Y.: A loop-top hard X-ray source in a compact solar flare as evidence for magnetic reconnection. Nature 371, 495–497 (1994)Google Scholar
  28. 28.
    Tomczak, M.: The analysis of hard X-ray radiation of flares with occulted footpoints. Astron. Astrophys. 366, 294–305 (2001)Google Scholar
  29. 29.
    Petrosian, V., Donaghy, T.Q., McTierman, J.M.: Loop top hard X-ray emission in solar flares: Images and statistics. Astrophys. J. 569, 459–473 (2002)Google Scholar
  30. 30.
    Krucker, S., Lin, R.P.: Hard X-ray emissions from partially occulted solar flares. Astrophys. J. 673, 1181–1187 (2008)Google Scholar
  31. 31.
    Krucker, S., Hudson, H.S., Glesener, L., White, S.M., Masuda, S., Wuelser, J.P., Lin, R.P.: Measurements of the coronal acceleration region of a solar flare. Astrophys. J. 714, 1108–1119 (2010)Google Scholar
  32. 32.
    Benz, A.O.: Millisecond radio spikes. Solar Phys. 104, 99–110 (1986)Google Scholar
  33. 33.
    Karlický, M.: Narrowband dm-spikes as indication of flare mass ejection. Solar Phys. 92, 329–342 (1984)Google Scholar
  34. 34.
    Stähli, M., Magun, A.: The microwave spectrum of solar millisecond spikes. Solar Phys. 104, 117–123 (1986)Google Scholar
  35. 35.
    Benz, A.O., Jaeggi, M., Zlobec, P.: Fine structure near the starting frequency of solar type III radio bursts. Astron. Astrophys. 109, 305–313 (1982)Google Scholar
  36. 36.
    Zlobec, P., Karlický, M.: Narrowband dm-spikes observed during the 15 June 1991 flare. Solar Phys. 182, 477–496 (1998)Google Scholar
  37. 37.
    Mészárosová, H., Veronig, A., Zlobec, P., Karlický, M.: Analysis of solar narrow band dm-spikes observed at 1420 and 2695 MHz. Astron. Astrophys. 407, 1115–1125 (2003)Google Scholar
  38. 38.
    Güdel, M., Zlobec, P.: Polarization and emission mode of solar radio spikes. Astron. Astrophys. 299, 299–309 (1991)Google Scholar
  39. 39.
    Kuijpers, J., Van der Post, P., Slottje, C.: Runaway acceleration in a radio flare. Astron. Astrophys. 103, 331–338 (1981)Google Scholar
  40. 40.
    Fleishman, G.D., Yastrebov, S.G.: On the harmonic structure of solar radio spikes. Solar Phys. 154, 361–369 (1994)Google Scholar
  41. 41.
    Karlický, M., Sobotka, M., Jiřička, K.: Narrowband dm-Spikes in the 2 GHz Frequency Range and MHD Cascading Waves in Reconnection Outflows. Solar Phys. 168, 375–383 (1996)Google Scholar
  42. 42.
    Karlický, Jiřička, K., Sobotka, M.: Power-law spectra of 1-2 GHz narrowband dm-spikes. Solar Phys., 195, 165–174 (2000)Google Scholar
  43. 43.
    Bárta, M., Karlický, M.: Turbulent plasma model of the narrowband dm-spikes. Astron. Astrophys. 379, 1045–1051 (2001)Google Scholar
  44. 44.
    Jiřička, K., Karlický, M., Mészárosová, H., Snížek, V.: Global statistics of 0.8-2.0 Ghz radio bursts and fine structures observed during 1992–2000 by the Ondřejov radiospectrograph. Astron. Astrophys. 375, 243–250 (2001)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Astronomical Institute of the Academy of Sciences of the Czech RepublicOndřejovCzech Republic

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