Magneto-static Modeling from SUNRISE/IMaX: Application to an Active Region Observed with SUNRISE II
2017 | journal article. A publication with affiliation to the University of Göttingen.
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Magneto-static Modeling from SUNRISE/IMaX: Application to an Active Region Observed with SUNRISE II
Wiegelmann, T.; Neukirch, T.; Nickeler, D. H.; Solanki, P. K.; Barthol, P.; Gandorfer, A. & Gizon, L. et al. (2017)
The Astrophysical Journal Supplement Series, 229(1) art. 18. DOI: https://doi.org/10.3847/1538-4365/aa582f
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Details
- Authors
- Wiegelmann, T.; Neukirch, T.; Nickeler, D. H.; Solanki, Parth K.; Barthol, P.; Gandorfer, A.; Gizon, Laurent ; Hirzberger, J.; Riethmueller, T. L.; van Noort, M.; Blanco Rodriguez, J.; Del Toro Iniesta, J. C.; Orozco Suarez, D.; Schmidt, W.; Pillet, V. Martinez; Knolker, M.
- 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 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.
- Issue Date
- 2017
- Status
- published
- Publisher
- Iop Publishing Ltd
- Journal
- The Astrophysical Journal Supplement Series
- ISSN
- 1538-4365; 0067-0049