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Small-scale structure and dynamics of the lower solar atmosphere

Published online by Cambridge University Press:  01 September 2007

Sven Wedemeyer-Böhm  and
Friedrich Wöger
Sven Wedemeyer-Böhm
Affiliation:
Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, N-0315 Oslo, Norway; email: sven.wedemeyer@astro.uio.no
Friedrich Wöger
Affiliation:
National Solar Observatory at Sacramento Peak, P.O. Box 62, Sunspot, NM 88349, USA; email: fwoeger@nso.edu
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Abstract

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The chromosphere of the quiet Sun is a highly intermittent and dynamic phenomenon. Three-dimensional radiation (magneto-)hydrodynamic simulations exhibit a mesh-like pattern of hot shock fronts and cool expanding post-shock regions in the sub-canopy part of the inter-network. This domain might be called “fluctosphere”. The pattern is produced by propagating shock waves, which are excited at the top of the convection zone and in the photospheric overshoot layer. New high-resolution observations reveal a ubiquitous small-scale pattern of bright structures and dark regions in-between. Although it qualitatively resembles the picture seen in models, more observations – e.g. with the future ALMA – are needed for thorough comparisons with present and future models. Quantitative comparisons demand for synthetic intensity maps and spectra for the three-dimensional (magneto-)hydrodynamic simulations. The necessary radiative transfer calculations, which have to take into account deviations from local thermodynamic equilibrium, are computationally very involved so that no reliable results have been produced so far. Until this task becomes feasible, we have to rely on careful qualitative comparisons of simulations and observations. Here we discuss what effects have to be considered for such a comparison. Nevertheless we are now on the verge of assembling a comprehensive picture of the solar chromosphere in inter-network regions as dynamic interplay of shock waves and structuring and guiding magnetic fields.

Keywords

Sun: chromosphereshock wavesMHD
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S247: Waves & Oscillations in the Solar Atmosphere: Heating and Magneto-Seismology , September 2007 , pp. 66 - 73
Copyright
Copyright © International Astronomical Union 2008

References

Avrett, E. H. 2007, in Astronomical Society of the Pacific Conf. Series, Vol. 368, The Physics of Chromospheric Plasmas, ed. Heinzel, P., Dorotovič, I., & Rutten, R. J., 81Google Scholar
Avrett, E. H., Kurucz, R. L., & Loeser, R. 2006, A&A, 452, 651Google Scholar
Ayres, T. R. 2002, ApJ, 575, 1104CrossRefGoogle Scholar
Bogdan, T. J., Carlsson, M., Hansteen, V. H., et al. 2003, ApJ, 599, 626CrossRefGoogle Scholar
Carlsson, M., Judge, P. G., & Wilhelm, K. 1997, ApJL, 486, L63Google Scholar
Carlsson, M. & Stein, R. F. 1995, ApJL, 440, L29CrossRefGoogle Scholar
Carlsson, M. & Stein, R. F. 1998, in IAU Symposium, Vol. 185, New Eyes to See Inside the Sun and Stars, ed. Deubner, F.-L., Christensen-Dalsgaard, J., & Kurtz, D., 435CrossRefGoogle Scholar
Carlsson, M. & Stein, R. F. 2002, ApJ, 572, 626CrossRefGoogle Scholar
Cauzzi, G., Reardon, K. P., Uitenbroek, H., et al. 2007, ArXiv e-prints, 709Google Scholar
De Pontieu, B., Erdélyi, R., & James, S. P. 2004, Nature, 430, 536Google Scholar
Fontenla, J. M., Avrett, E. H., & Loeser, R. 1993, ApJ, 406, 319 (FAL)CrossRefGoogle Scholar
Fossum, A. & Carlsson, M. 2005, Nature, 435, 919CrossRefGoogle Scholar
Freytag, B., Steffen, M., & Dorch, B. 2002, Astron. Nachr., 323, 2133.0.CO;2-H>CrossRefGoogle Scholar
Hansteen, V. H. & Gudiksen, B. 2005, in ESA Special Publication, Vol. 592, Solar Wind 11/SOHO 16, Connecting Sun and HeliosphereGoogle Scholar
Judge, P. 2006, in Astronomical Society of the Pacific Conf. Series, Vol. 354, Solar MHD Theory and Observations: A High Spatial Resolution Perspective, ed. Leibacher, J., Stein, R. F., & Uitenbroek, H., 259Google Scholar
Kalkofen, W. 2003a, in ASP Conf. Series, Vol. 286, Current Theoretical Models and Future High Resolution Solar Observations: Preparing for ATST, ed. Pevtsov, A. & Uitenbroek, H., 443Google Scholar
Kalkofen, W. 2003b, in Bulletin of the American Astronomical Society, Vol. 35, 826Google Scholar
Kalkofen, W. 2004, in IAU Symposium, Vol. 219, Stars as Suns : Activity, Evolution and Planets, ed. Dupree, A. K. & Benz, A. O., 115Google Scholar
Kalkofen, W. 2005, in ESA SP, Vol. 560, 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, ed. Favata, F. & et al. , 695Google Scholar
Langangen, O., Carlsson, M., Rouppe van der Voort, L., Hansteen, V., & De Pontieu, B. 2007, ArXiv e-prints, 710Google Scholar
Leenaarts, J., Carlsson, M., Hansteen, V., & Rutten, R. J. 2007, A&A, 473, 625Google Scholar
Leenaarts, J. & Wedemeyer-Böhm, S. 2006, A&A, 460, 301Google Scholar
Reardon, K. P., Cauzzi, G., & Rimmele, T. 2007, in Astronomical Society of the Pacific Conf. Series, Vol. 368, The Physics of Chromospheric Plasmas, ed. Heinzel, P., Dorotovič, I., & Rutten, R. J., 151Google Scholar
Rouppe van der Voort, L. H. M., De Pontieu, B., Hansteen, V. H., Carlsson, M., & van Noort, M. 2007, ApJL, 660, L169CrossRefGoogle Scholar
Rutten, R. J. 2006, in ASP Conf. Series, Vol. 354, Solar MHD Theory and Observations: A High Spatial Resolution Perspective, ed. Leibacher, J., Stein, R. F., & Uitenbroek, H., 276Google Scholar
Rutten, R. J. 2007, in Astronomical Society of the Pacific Conf. Series, Vol. 368, The Physics of Chromospheric Plasmas, ed. Heinzel, P., Dorotovič, I., & Rutten, R. J., 27Google Scholar
Schaffenberger, W., Wedemeyer-Böhm, S., Steiner, O., & Freytag, B. 2005, in ESA SP, Vol. 596, Chromospheric and Coronal Magnetic Fields, ed. Innes, D. E., Lagg, A., & Solanki, S. A.Google Scholar
Schaffenberger, W., Wedemeyer-Böhm, S., Steiner, O., & Freytag, B. 2006, in Astronomical Society of the Pacific Conf. Series, Vol. 354, Solar MHD Theory and Observations: A High Spatial Resolution Perspective, ed. Leibacher, J., Stein, R. F., & Uitenbroek, H., 345Google Scholar
Skartlien, R., Stein, R. F., & Nordlund, Å. 2000, ApJ, 541, 468CrossRefGoogle Scholar
Tritschler, A., Schmidt, W., Uitenbroek, H., & Wedemeyer-Böhm, S. 2007, A&A, 462, 303Google Scholar
Vernazza, J. E., Avrett, E. H., & Loeser, R. 1981, ApJS, 45, 635 (VAL)CrossRefGoogle Scholar
Wahlstrom, C. & Carlsson, M. 1994, ApJ, 433, 417CrossRefGoogle Scholar
Wedemeyer, S., Freytag, B., Steffen, M., Ludwig, H.-G., & Holweger, H. 2004, A&A, 414, 1121Google Scholar
Wedemeyer-Böhm, S., Ludwig, H. G., Steffen, M., Leenaarts, J., & Freytag, B. 2007, A&A, 471, 977Google Scholar
Wilhelm, K., Schühle, U., Curdt, W., et al. 2005, A&A, 439, 701Google Scholar
Wöger, F., Wedemeyer-Böhm, S., Schmidt, W., & von der Lühe, O. 2006, A&A, 459, L9Google Scholar