Boris Vilhelm Gudiksen

• Frogner, Lars; Gudiksen, Boris Vilhelm & Bakke, Helle (2020). Accelerated particle beams in a 3D simulation of the quiet Sun. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 643. doi: 10.1051/0004-6361/202038529. Full text in Research Archive Show summary

  Context. Observational and theoretical evidence suggest that beams of accelerated particles are produced in flaring events of all sizes in the solar atmosphere, from X-class flares to nanoflares. Current models of these types of particles in flaring loops assume an isolated 1D atmosphere. Aims. A more realistic environment for modelling accelerated particles can be provided by 3D radiative magnetohydrodynamics codes. Here, we present a simple model for particle acceleration and propagation in the context of a 3D simulation of the quiet solar atmosphere, spanning from the convection zone to the corona. We then examine the additional transport of energy introduced by the particle beams. Methods. The locations of particle acceleration associated with magnetic reconnection were identified by detecting changes in magnetic topology. At each location, the parameters of the accelerated particle distribution were estimated from local conditions. The particle distributions were then propagated along the magnetic field, and the energy deposition due to Coulomb collisions with the ambient plasma was computed. Results. We find that particle beams originate in extended acceleration regions that are distributed across the corona. Upon reaching the transition region, they converge and produce strands of intense heating that penetrate the chromosphere. Within these strands, beam heating consistently dominates conductive heating below the bottom of the transition region. This indicates that particle beams qualitatively alter the energy transport even outside of active regions.

• Martinez-Sykora, Juan; Hansteen, Viggo; Gudiksen, Boris Vilhelm; Carlsson, Mats; De Pontieu, Bart Walter & Gošić, Milan (2019). On the Origin of the Magnetic Energy in the Quiet Solar Chromosphere. The Astrophysical Journal (ApJ). ISSN 0004-637X. 878(1). doi: 10.3847/1538-4357/ab1f0b. Full text in Research Archive
• Cheung, M. C. M.; Rempel, M.; Chintzoglou, G.; Chen, F.; Testa, Paola & Martinez-Sykora, Juan [Show all 14 contributors for this article] (2019). A comprehensive three-dimensional radiative magnetohydrodynamic simulation of a solar flare. Nature Astronomy. ISSN 2397-3366. 3, p. 160–166. doi: 10.1038/s41550-018-0629-3.
• Kanella, Charalambos & Gudiksen, Boris Vilhelm (2019). Emission of Joule heating events in simulations of the solar corona. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 621. doi: 10.1051/0004-6361/201833634. Full text in Research Archive
• Bakke, Helle; Frogner, Lars & Gudiksen, Boris Vilhelm (2018). Non-thermal electrons from solar nanoflares In a 3D radiative MHD simulation. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 620. doi: 10.1051/0004-6361/201834129. Full text in Research Archive
• Zacharias, Pia; Hansteen, Viggo; Leenaarts, Jorrit; Carlsson, Mats & Gudiksen, Boris Vilhelm (2018). Disentangling flows in the solar transition region. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 614. doi: 10.1051/0004-6361/201732055. Full text in Research Archive
• Kanella, Charalambos & Gudiksen, Boris Vilhelm (2018). Investigating 4D coronal heating events in magnetohydrodynamic simulations. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 617. doi: 10.1051/0004-6361/201732494. Full text in Research Archive
• Martinez-Sykora, Juan; De Pontieu, Bart Walter; Carlsson, Mats; Hansteen, Viggo; Nobrega-Siverio, Daniel & Gudiksen, Boris Vilhelm (2017). Two-dimensional Radiative Magnetohydrodynamic Simulations of Partial Ionization in the Chromosphere. II. Dynamics and Energetics of the Low Solar Atmosphere. The Astrophysical Journal (ApJ). ISSN 0004-637X. 847(1). doi: 10.3847/1538-4357/aa8866. Full text in Research Archive
• Kanella, Charalambos & Gudiksen, Boris Vilhelm (2017). Identification of coronal heating events in 3D simulations. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 603. doi: 10.1051/0004-6361/201730748. Full text in Research Archive
• Kato, Yoshiaki; Steiner, Oskar; Hansteen, Viggo; Gudiksen, Boris Vilhelm; Wedemeyer, Sven & Carlsson, Mats (2016). Chromospheric and Coronal Wave Generation in a Magnetic Flux Sheath. The Astrophysical Journal (ApJ). ISSN 0004-637X. 827(1). doi: 10.3847/0004-637X/827/1/7.
• Martinez-Sykora, Juan; De Pontieu, Bart Walter; Hansteen, Viggo & Gudiksen, Boris Vilhelm (2016). TIME DEPENDENT NONEQUILIBRIUM IONIZATION of TRANSITION REGION LINES OBSERVED with IRIS. The Astrophysical Journal (ApJ). ISSN 0004-637X. 817(1). doi: 10.3847/0004-637X/817/1/46. Full text in Research Archive
• Carlsson, Mats; Hansteen, Viggo; Gudiksen, Boris Vilhelm; Leenaarts, Jorrit & De Pontieu, Bart Walter (2016). A publicly available simulation of an enhanced network region of the Sun. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 585:A4. doi: 10.1051/0004-6361/201527226. Full text in Research Archive
• Hansteen, Viggo; Carlsson, Mats & Gudiksen, Boris Vilhelm (2015). Numerical Modeling of the Solar Chromosphere and Corona: What Has Been Done? What Should Be Done? Astronomical Society of the Pacific Conference Series. ISSN 1050-3390. 498, p. 141–146.
• Hansteen, Viggo; Carlsson, Mats & Gudiksen, Boris Vilhelm (2015). IRIS observations and 3D `realistic' MHD models of the solar chromosphere. In Cenarro, A. J.; Figueras, F.; Hernández-Monteagudo, C.; Trujillo Bueno, J. & Valdivielso, L. (Ed.), Highlights of Spanish Astrophysics VIII, Proceedings of the XI Scientific Meeting of the Spanish Astronomical Society (SEA) held in Teruel, September 8-12, 2014. Sociedad Española de Astronomía. ISSN 978-84-606-8760-3. p. 19–28.
• Olluri, Kosovare; Gudiksen, Boris Vilhelm; Hansteen, Viggo & De Pontieu, Bart Walter (2015). Synthesized spectra of optically thin emission lines produced by the Bifrost stellar atmosphere code, including nonequilibrium ionization effects: A study of the intensity, nonthermal line widths, and Doppler shifts. The Astrophysical Journal (ApJ). ISSN 0004-637X. 802(1). doi: 10.1088/0004-637X/802/1/5. Full text in Research Archive
• Fletcher, L.; Cargill, P. J.; Antiochos, S. K. & Gudiksen, Boris Vilhelm (2015). Structures in the Outer Solar Atmosphere. Space Science Reviews. ISSN 0038-6308. 188, p. 211–249. doi: 10.1007/s11214-014-0111-1.
• Olluri, Kosovare; Gudiksen, Boris Vilhelm & Hansteen, Viggo (2013). NON-EQUILIBRIUM IONIZATION EFFECTS ON THE DENSITY LINE RATIO DIAGNOSTICS OF O IV. The Astrophysical Journal (ApJ). ISSN 0004-637X. 767(1). doi: 10.1088/0004-637X/767/1/43.
• Olluri, Kosovare; Gudiksen, Boris Vilhelm & Hansteen, Viggo (2013). NON-EQUILIBRIUM IONIZATION IN THE BIFROST STELLAR ATMOSPHERE CODE. Astronomical Journal. ISSN 0004-6256. 145(3). doi: 10.1088/0004-6256/145/3/72.
• Collet, R.; Hayek, Wolfgang; Asplund, Martin; Nordlund, Å.; Trampedach, R & Gudiksen, Boris Vilhelm (2011). Three-dimensional surface convection simulations of metal-poor stars. The effect of scattering on the photospheric temperature stratification. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 528. doi: 10.1051/0004-6361/201016151.
• Gudiksen, Boris Vilhelm; Carlsson, Mats; Hayek, Wolfgang; Hansteen, Viggo; Leenaarts, Jorrit & Martinez-Sykora, Juan (2011). The stellar atmosphere simulation code Bifrost. Code description and validation. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 531. doi: 10.1051/0004-6361/201116520.
• Leenaarts, J.; Carlsson, Mats; Hansteen, Viggo & Gudiksen, Boris Vilhelm (2011). On the minimum temperature of the quiet solar chromosphere. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 530. doi: 10.1051/0004-6361/201016392.
• Hayek, Wolfgang Simon; Asplund, M; Carlsson, Mats; Trampedach, R; Collet, R. & Gudiksen, Boris Vilhelm [Show all 8 contributors for this article] (2010). Radiative transfer with scattering for domain-decomposed 3D MHD simulations of cool stellar atmospheres Numerical methods and application to the quiet, non-magnetic, surface of a solar-type star. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 517. doi: 10.1051/0004-6361/201014210.
• Carlsson, Mats; Hansteen, Viggo & Gudiksen, Boris Vilhelm (2010). Chromospheric heating and structure as determined from high resolution 3D simulations. MEMORIE della Società Astronomica Italiana. ISSN 0037-8720. 81, p. 582–587.
• Bingert, Sven; Zacharias, P; Peter, Hardi & Gudiksen, Boris Vilhelm (2010). On the nature of coronal loops above the quiet sun network. Advances in Space Research. ISSN 0273-1177. 45(2), p. 310–313. doi: 10.1016/j.asr.2009.08.020.
• Gudiksen, Boris Vilhelm (2009). Coronal dynamics and heating theories. Advances in Space Research. ISSN 0273-1177. 43(1), p. 108–112. doi: 10.1016/j.asr.2008.05.012.
• de Jesus, Leandro Filipe Gomes & Gudiksen, Boris Vilhelm (2009). PHOTOSPHERIC MOTIONS AND THEIR EFFECTS ON THE CORONA: A NUMERICAL APPROACH. The Astrophysical Journal (ApJ). ISSN 0004-637X. 704(1), p. 705–714. doi: 10.1088/0004-637X/704/1/705.
• Gudiksen, Boris Vilhelm (2008). Coronal Dynamics and Heating Theories. Advances in Space Research. ISSN 0273-1177. 43(1), p. 108–112. doi: 10.1016/j.asr.2008.05.012.
• Hansteen, Viggo; Carlsson, Mats Per-Olof & Gudiksen, Boris Vilhelm (2007). 3D Numerical Models of the Chromosphere, Transition Region, and Corona. In Heinzel, Petr; Dorotovic, Ivan & Rutten, Robert (Ed.), The Physics of Chromospheric Plasmas. Astronomical Society of the Pacific. ISSN 978-1-583812-36-5. p. 107–114.
• Gudiksen, Boris Vilhelm (2007). Topological Dissipation and the Solar Corona. In Shibata, K.; Nagata, S. & Sakurai, T. (Ed.), New Solar Physics with Solar-B Mission. Astronomical Society of the Pacific. ISSN 978-1-58381-237-2. p. 269–277.
• Gudiksen, Boris Vilhelm (2007). Heating the solar corona. MEMORIE della Società Astronomica Italiana. ISSN 0037-8720. 78(2), p. 293–297.
• Peter, H.; Gudiksen, Boris & Nordlund, Å. (2006). Forward modeling of the corona of the sun and solar-like stars: From a three-dimensional magnetohydrodynamic model to synthetic extreme-ultraviolet spectra. The Astrophysical Journal (ApJ). ISSN 0004-637X. 638, p. 1086–1100.
• Gudiksen, Boris & Nordlund, Å. (2005). An Ab Initio Approach to the Solar Coronal Heating Problem. The Astrophysical Journal (ApJ). ISSN 0004-637X. 618, p. 1020–1030.
• Gudiksen, Boris & Nordlund, Å. (2005). An Ab Initio Approach to Solar Coronal Loops. The Astrophysical Journal (ApJ). ISSN 0004-637X. 618, p. 1031–1038. doi: 10.1086/426064.
• Peter, Hardi; Gudiksen, Boris & Nordlund, Å. (2004). Coronal Heating through Braiding of Magnetic Field lines. The Astrophysical Journal (ApJ). ISSN 0004-637X. 617, p. L85–L88.

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• Gudiksen, Boris Vilhelm; Frogner, Lars; Bakke, Helle & Clemmensen, Frederik (2020). Accelerated particles in the solar atmosphere .
• Gudiksen, Boris Vilhelm; Frogner, Lars & Bakke, Helle (2020). Accelerated particles in the solar atmosphere.
• Gudiksen, Boris Vilhelm (2020). Our active Sun.
• Gudiksen, Boris Vilhelm (2018). Nvidia Hackaton - The Bifrost Project.
• Gudiksen, Boris Vilhelm (2018). Solar Physics and HPC.
• Gudiksen, Boris Vilhelm (2017). News coverage of the naming of the Parker solar probe plus on Dansish national TV channel TV2. [TV]. Danish National TV.
• Kato, Yoshiaki; Steiner, Oskar; Hansteen, Viggo; Carlsson, Mats & Gudiksen, Boris Vilhelm (2014). Chromospheric and Corona Wave Generation in Flux Tubes.
• Carlsson, Mats; Hansteen, Viggo; Pereira, Tiago Mendes Domingos; Leenaarts, Jorrit; Gudiksen, Boris Vilhelm & De Pontieu, Bart Walter (2013). First Comparison between IRIS Data and Numerical Models.
• Gudiksen, Boris Vilhelm (2013). Advanced computer simulations helps understand the active solar atmosphere. META. ISSN 1890-1956. p. 18–21.
• Olluri, Kosovare; Gudiksen, Boris Vilhelm & Hansteen, Viggo (2012). non-equilibrium ionization in 3D numerical models.
• Olluri, Kosovare; Hansteen, Viggo & Gudiksen, Boris Vilhelm (2011). Non-equilibrium ionization in 3D numerical models.
• Olluri, Kosovare; Hansteen, Viggo & Gudiksen, Boris Vilhelm (2010). Non-equilibrium ionization of transition region elements in 3D numerical models.
• Carlsson, Mats; Hansteen, Viggo & Gudiksen, Boris Vilhelm (2010). 3D MHD modeling of the solar chromosphere.
• Carlsson, Mats; Hansteen, Viggo & Gudiksen, Boris Vilhelm (2009). Chromospheric heating and structure: 3D simulations.
• Gudiksen, Boris Vilhelm (2008). Vapor.
• Carlsson, Mats; Hansteen, Viggo & Gudiksen, Boris Vilhelm (2008). Dynamic MHD models of the chromosphere and corona.
• Gudiksen, Boris Vilhelm (2008). Solen.
• Gudiksen, Boris Vilhelm (2007). Coronal Loops.
• Gudiksen, Boris Vilhelm (2005). Topological dissipation and the Solar Corona.
• Gudiksen, Boris Vilhelm (2005). Connections: Photosphere - Chromosphere - Corona.
• Gudiksen, Boris Vilhelm (2005). DC-Heating - Is it enough?
• Hansteen, Viggo & Gudiksen, Boris (2005). 3d Numerical Models of Quiet Sun Coronal Heating.
• Peter, Hardi; Gudiksen, Boris & Nordlund, Å. (2004). Analysis of Synthetic EUV Spectra from 3d Models of the Corona.
• Kanella, Charalambos & Gudiksen, Boris Vilhelm (2018). On the Identification of Small-Scaled Heating Events in MHD Simulations of the Solar Corona. Det matematisk-naturvitenskapelige fakultet, Universitetet i Oslo . ISSN 1501-7710.

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