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Energy Cascades in Large-Scale Solar Flare Reconnection

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

Abstract

Very fast energy release is sometimes observed in large-scale current layers formed in astrophysical plasmas. Solar flares represent a clear example. The dissipation and changes of the magnetic field topology in the almost collision-less plasmas are inherently related to plasma-kinetic processes in very thin current sheets (CSs). Question arises, how the originally thick current layer is efficiently fragmented into these small-scale dissipative CSs. We investigated this question by means of high-resolution MHD simulations. In addition to the earlier considered chain plasmoid instability we identified other elementary process for energy transport from large to small scales – fragmenting coalescence of plasmoids. This result changes so far basically 1D picture of energy cascade in a large scale magnetic reconnection and reveals multi-dimensional nature of the fragmentation process. At the same moment it shows that plasmoid coalescence contributes – quite surprisingly – to the direct energy cascade.

Keywords

Solar Flare Magnetic Reconnection Current Layer Astrophysical Plasma Anomalous Resistivity 
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 (GA CR), P209/10/1680 (GA CR), 5322215000801 (IGA UJEP) and the research project AV0Z10030501 of the Astronomical Institute of the Academy of Sciences.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Miroslav Bárta
    • 1
  • Jan Skála
    • 2
  • Marian Karlický
    • 1
  • Jörg Büchner
    • 3
  1. 1.Astronomical Institute ASCROndřejovCzechia
  2. 2.Faculty of Science, UJEPÚstí nad LabemCzechia
  3. 3.MPS LindauKatlenburg-LindauGermany

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