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Title: Magneto-static Modeling from Sunrise/IMaX: Application to an Active Region Observed with Sunrise II

Abstract

Magneto-static models may overcome some of the issues facing force-free magnetic field extrapolations. So far they have seen limited use and have faced problems when applied to quiet-Sun data. Here we present a first application to an active region. We use solar vector magnetic field measurements gathered by the IMaX polarimeter during the flight of the Sunrise balloon-borne solar observatory in 2013 June as boundary conditions for a magneto-static model of the higher solar atmosphere above an active region. The IMaX data are embedded in active region vector magnetograms observed with SDO /HMI. This work continues our magneto-static extrapolation approach, which was applied earlier to a quiet-Sun region observed with Sunrise I. In an active region the signal-to-noise-ratio in the measured Stokes parameters is considerably higher than in the quiet-Sun and consequently the IMaX measurements of the horizontal photospheric magnetic field allow us to specify the free parameters of the model in a special class of linear magneto-static equilibria. The high spatial resolution of IMaX (110–130 km, pixel size 40 km) enables us to model the non-force-free layer between the photosphere and the mid-chromosphere vertically by about 50 grid points. In our approach we can incorporate some aspects of themore » mixed beta layer of photosphere and chromosphere, e.g., taking a finite Lorentz force into account, which was not possible with lower-resolution photospheric measurements in the past. The linear model does not, however, permit us to model intrinsic nonlinear structures like strongly localized electric currents.« less

Authors:
; ; ; ; ; ; ;  [1];  [2];  [3];  [4]; ;  [5];  [6];  [7];  [8]
  1. Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, D-37077 Göttingen (Germany)
  2. School of Mathematics and Statistics, University of St. Andrews, St. Andrews KY16 9SS (United Kingdom)
  3. Astronomical Institute, AV CR, Fricova 298, 25165 Ondrejov (Czech Republic)
  4. Grupo de Astronomía y Ciencias del Espacio, Universidad de Valencia, E-46980 Paterna, Valencia (Spain)
  5. Instituto de Astrofísica de Andalucía (CSIC), Apartado de Correos 3004, E-18080 Granada (Spain)
  6. Kiepenheuer-Institut für Sonnenphysik, Schöneckstr. 6, D-79104 Freiburg (Germany)
  7. National Solar Observatory, 3665 Discovery Drive, Boulder, CO 80303 (United States)
  8. High Altitude Observatory, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 (United States)
Publication Date:
OSTI Identifier:
22661238
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal, Supplement Series; Journal Volume: 229; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; BALLOONS; CHROMOSPHERE; ELECTRIC CURRENTS; EQUILIBRIUM; FORCE-FREE MAGNETIC FIELDS; LAYERS; LORENTZ FORCE; NOISE; PHOTOSPHERE; POLARIMETRY; SIGNAL-TO-NOISE RATIO; SPATIAL RESOLUTION; STOKES PARAMETERS; SUN

Citation Formats

Wiegelmann, T., Solanki, S. K., Barthol, P., Gandorfer, A., Gizon, L., Hirzberger, J., Riethmüller, T. L., Noort, M. van, Neukirch, T., Nickeler, D. H., Rodríguez, J. Blanco, Iniesta, J. C. Del Toro, Suárez, D. Orozco, Schmidt, W., Pillet, V. Martínez, and Knölker, M., E-mail: wiegelmann@mps.mpg.de. Magneto-static Modeling from Sunrise/IMaX: Application to an Active Region Observed with Sunrise II. United States: N. p., 2017. Web. doi:10.3847/1538-4365/AA582F.
Wiegelmann, T., Solanki, S. K., Barthol, P., Gandorfer, A., Gizon, L., Hirzberger, J., Riethmüller, T. L., Noort, M. van, Neukirch, T., Nickeler, D. H., Rodríguez, J. Blanco, Iniesta, J. C. Del Toro, Suárez, D. Orozco, Schmidt, W., Pillet, V. Martínez, & Knölker, M., E-mail: wiegelmann@mps.mpg.de. Magneto-static Modeling from Sunrise/IMaX: Application to an Active Region Observed with Sunrise II. United States. doi:10.3847/1538-4365/AA582F.
Wiegelmann, T., Solanki, S. K., Barthol, P., Gandorfer, A., Gizon, L., Hirzberger, J., Riethmüller, T. L., Noort, M. van, Neukirch, T., Nickeler, D. H., Rodríguez, J. Blanco, Iniesta, J. C. Del Toro, Suárez, D. Orozco, Schmidt, W., Pillet, V. Martínez, and Knölker, M., E-mail: wiegelmann@mps.mpg.de. Wed . "Magneto-static Modeling from Sunrise/IMaX: Application to an Active Region Observed with Sunrise II". United States. doi:10.3847/1538-4365/AA582F.
@article{osti_22661238,
title = {Magneto-static Modeling from Sunrise/IMaX: Application to an Active Region Observed with Sunrise II},
author = {Wiegelmann, T. and Solanki, S. K. and Barthol, P. and Gandorfer, A. and Gizon, L. and Hirzberger, J. and Riethmüller, T. L. and Noort, M. van and Neukirch, T. and Nickeler, D. H. and Rodríguez, J. Blanco and Iniesta, J. C. Del Toro and Suárez, D. Orozco and Schmidt, W. and Pillet, V. Martínez and Knölker, M., E-mail: wiegelmann@mps.mpg.de},
abstractNote = {Magneto-static models may overcome some of the issues facing force-free magnetic field extrapolations. So far they have seen limited use and have faced problems when applied to quiet-Sun data. Here we present a first application to an active region. We use solar vector magnetic field measurements gathered by the IMaX polarimeter during the flight of the Sunrise balloon-borne solar observatory in 2013 June as boundary conditions for a magneto-static model of the higher solar atmosphere above an active region. The IMaX data are embedded in active region vector magnetograms observed with SDO /HMI. This work continues our magneto-static extrapolation approach, which was applied earlier to a quiet-Sun region observed with Sunrise I. In an active region the signal-to-noise-ratio in the measured Stokes parameters is considerably higher than in the quiet-Sun and consequently the IMaX measurements of the horizontal photospheric magnetic field allow us to specify the free parameters of the model in a special class of linear magneto-static equilibria. The high spatial resolution of IMaX (110–130 km, pixel size 40 km) enables us to model the non-force-free layer between the photosphere and the mid-chromosphere vertically by about 50 grid points. In our approach we can incorporate some aspects of the mixed beta layer of photosphere and chromosphere, e.g., taking a finite Lorentz force into account, which was not possible with lower-resolution photospheric measurements in the past. The linear model does not, however, permit us to model intrinsic nonlinear structures like strongly localized electric currents.},
doi = {10.3847/1538-4365/AA582F},
journal = {Astrophysical Journal, Supplement Series},
number = 1,
volume = 229,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}