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TU Berlin

MHD simulations of reconnection and eruptions in turbulent stellar coronae

Physical problems: Eruption of Stellar flares and Coronal Mass ejections (CMEs)

Flux rope stability, Subgrid-Scale consideration of MHD turbulence

Currently used MHD code: GOEMHD3

Selected publications:

  • de Souza e Almeida Silva, S., Santos, J. C., Büchner, J., & Alves, M. V. (2018). Nonlocal heat flux effects on temperature evolution of the solar atmosphere. Astronomy & Astrophysics. https://doi.org/10.1051/0004-6361/201730580
  • Yang, S., Büchner, J., Skála, J., & Zhang, H. (2018). Evolution of relative magnetic helicity. New boundary conditions for the vector potential. Astronomy & Astrophysics. https://doi.org/10.1051/0004-6361/201628108
  • Inoue, S., Kusano, K., Büchner, J., & Skála, J. (2018). Formation and dynamics of a solar eruptive flux tube. Nature Communications, 9(1), 174. https://doi.org/10.1038/s41467-017-02616-8
  • Widmer, F., Büchner, J., & Yokoi, N. (2016). Characterizing plasmoid reconnection by turbulence dynamics. Physics of Plasmas, 23(9), 92304. https://doi.org/10.1063/1.4962694
  • Widmer, F., Büchner, J., & Yokoi, N. (2016). Sub-grid-scale description of turbulent magnetic reconnection in magnetohydrodynamics. Physics of Plasmas, 23(4), 42311. https://doi.org/10.1063/1.4947211
  • Skála, J., Baruffa, F., Büchner, J., & Rampp, M. (2015). The 3D MHD code GOEMHD3 for astrophysical plasmas with large Reynolds numbers. Astronomy & Astrophysics, 580(25274), A48. Solar and Stellar Astrophysics. https://doi.org/10.1051/0004-6361/201425274
  • Santos, J. C., Sibeck, D. G., Büchner, J., Gonzalez, W. D., & Ferreira, J. L. (2014). Three-dimensional MHD simulation of FTEs produced by merging at an isolated point in a sheared magnetic field configuration. Journal of Geophysical Research: Space Physics, 119(3), 2009–2023. https://doi.org/10.1002/2013JA018964
  • Adamson, E., Büchner, J., & Otto, A. (2013). On the role of current dissipation in the energization of coronal bright points. Astronomy & Astrophysics, 557, A118. https://doi.org/10.1051/0004-6361/201321281
  • Yang, S., Büchner, J., Santos, J. C., & Zhang, H. (2013). Evolution of Relative Magnetic Helicity: Method of Computation and Its Application to a Simulated Solar Corona above an Active Region. Solar Physics, 283(2), 369–382. https://doi.org/10.1007/s11207-013-0236-5
  • Bárta, M., Skála, J., Karlický, M., & Büchner, J. (2012). Energy Cascades in Large-Scale Solar Flare Reconnection. In M. P. Leubner & Z. Vörös (Eds.), Multi-scale Dynamical Processes in Space and Astrophysical Plasmas (Vol. 33, pp. 43–48). Berlin, Heidelberg: Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-30442-2_5
  • Bárta, M., Büchner, J., Karlický, M., & Kotrč, P. (2011). Spontaneous Current-Layer Fragmentation And Cascading Reconnection In Solar Flares. II. Relation To Observations. The Astrophysical Journal, 730(1), 47. https://doi.org/10.1088/0004-637X/730/1/47
  • Bárta, M., Büchner, J., Karlický, M., & Skála, J. (2011). Spontaneous Current-Layer Fragmentation And Cascading Reconnection In Solar Flares. I. Model And Analysis. The Astrophysical Journal, 737(1), 24. https://doi.org/10.1088/0004-637X/737/1/24
  • Santos, J. C., Büchner, J., & Otto, A. (2011). 3D MHD simulations of electric current development in a rotating sunspot: active region NOAA 8210. Astronomy & Astrophysics, 535, A111. https://doi.org/10.1051/0004-6361/201116792
  • Javadi, S., Büchner, J., Otto, A., & Santos, J. C. (2011). About the relative importance of compressional heating and current dissipation for the formation of coronal X-ray bright points. Astronomy & Astrophysics, 529, A114. https://doi.org/10.1051/0004-6361/201015614
  • Santos, J. C., Büchner, J., & Otto, A. (2011). Development of electric currents in a magnetic field configuration containing a magnetic null point. Astronomy & Astrophysics, 525, A3. https://doi.org/10.1051/0004-6361/201014758
  • Bárta, M., Büchner, J., & Karlický, M. (2010). Multi-scale MHD approach to the current sheet filamentation in solar coronal reconnection. Advances in Space Research, 45(1), 10–17. https://doi.org/10.1016/j.asr.2009.07.025
  • Guo, J.-N., Büchner, J., Otto, A., Santos, J., Marsch, E., & Gan, W.-Q. (2010). Is the 3-D magnetic null point with a convective electric field an efficient particle accelerator? Astronomy and Astrophysics, 513, A73. https://doi.org/10.1051/0004-6361/200913321
  • Yang, S., Zhang, H., & Büchner, J. (2009). Magnetic helicity accumulation and tilt angle evolution of newly emerging active regions. Astronomy and Astrophysics, 502(1), 333–340. https://doi.org/10.1051/0004-6361/200810032
  • Yang, S., Büchner, J., & Zhang, H. (2009). Magnetic helicity exchange between neighboring active regions. Astrophysical Journal, 695(1), L25–L30. https://doi.org/10.1088/0004-637X/695/1/L25
  • Li, X., Büchner, J., & Zhang, H. (2009). Tracking moving magnetic features in the photosphere. Science in China Series G: Physics, Mechanics and Astronomy, 52(11), 1737–1748. https://doi.org/10.1007/s11433-009-0245-4
  • Maclean, R. C., Büchner, J., & Priest, E. R. (2009). Relationship between the topological skeleton, current concentrations, and 3D magnetic reconnection sites in the solar atmosphere. Astronomy & Astrophysics, 501(1), 321–333. https://doi.org/10.1051/0004-6361:20078664
  • Santos, J. C., Büchner, J., Madjarska, M. S., & Alves, M. V. (2008). On the relation between DC current locations and an EUV bright point: A case study. Astronomy & Astrophysics, 490(1), 345–352. https://doi.org/10.1051/0004-6361:200809975
  • Santos, J. C., Büchner, J., & Zhang, H. (2008). Inferring plasma flow velocities from photospheric vector magnetic field observations for the investigation of flare onsets. Advances in Space Research, 42(5), 812–821. https://doi.org/10.1016/j.asr.2007.05.082
  • Santos, J. C., & Büchner, J. (2007). MHD simulation of electric currents in the solar atmosphere caused by photospheric plasma motion. Astrophysics and Space Sciences Transactions, 3(1), 29–33. https://doi.org/10.5194/astra-3-29-2007
  • Büchner, J. (2006). Locating Current Sheets in the Solar Corona. Space Science Reviews, 122(1–4), 149–160. https://doi.org/10.1007/s11214-006-8213-z

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