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

0481194 - ASÚ 2018 RIV US eng J - Journal Article
Wiegelmann, T. - Neukirch, A.J. - Nickeler, Dieter Horst - Solanki, S.K. - Barthol, P. - Gandorfer, A. - Gizon, L. - Hirzberger, J. - Riethmueller, T.L. - van Noort, M. - Blanco Rodriguez, J. - del Toro Iniesta, J.C. - Orozco Suárez, D. - Schmidt, W. - Pillet, V.M. - Knolker, M.
Magneto-static Modeling from SUNRISE/IMaX: Application to an Active Region Observed with SUNRISE II.
Astrophysical Journal Supplement Series. Roč. 229, č. 1 (2017), 18/1-18/12. ISSN 0067-0049. E-ISSN 1538-4365
R&D Projects: GA ČR(CZ) GA16-05011S; GA ČR(CZ) GA16-13277S
Institutional support: RVO:67985815
Keywords : Sun * chromosphere * corona
OECD category: Astronomy (including astrophysics,space science)

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.
Permanent Link: http://hdl.handle.net/11104/0276793