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Figure 1:
Polarimetry Calibration for 13-Sep.-2007. The lines are
theoretical curves fitted to the data recorded for the polarimetric
states. The horizontal dotted lines are the LP-only observations,
the vertical dashed lines are the fitted angle offset (for 0![]() ![]() |
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Figure 2: Instrumental polarization for 12-Sep.-2006 as a function of time. The plotted curves are the model predicted telescope polarization for Q (solid), U (dotted) and V (dashed), the crosses are the actual values measured below the exit window of the telescope. |
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Figure 3:
Sunspot AR10908 observed on 12 Sep. 2006 in
Fe I 630.25 nm -5 pm. The color scaling saturates at
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Figure 4: Schematic drawing of the optical set-up. |
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Figure 5:
Sketch of the acquisition scheme of a full Stokes MOMFBD data
set for 2 line positions. The 2 line positions,
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Figure 6: Panel a) shows a magnetogram-like image constructed from flatfielded images of the same liquid crystal state. Panel b) shows a similar image constructed from a MOMFBD restoration based on the same images as panel a). Both panel a) and b) have the same scaling, -0.01 to +0.01. Panel c) shows the Fe I 630.2 -5 pm Stokes V magnetogram from the same data set and the same number of images. The scaling is -0.05 to +0.05. Panel d) shows the wide band image of the same region and data set. |
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Figure 7:
Noise in ``fake'' magnetograms as function of number of
exposures per state. The solid line is for flatfielded data, similar
to panel a) of Fig. 6. Crosses are MOMFBD
restored data, similar to panel b) of Fig. 6. The
dotted line is the 1/![]() |
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Figure 8:
Panel a) shows a part of a Fe I 630.2 -5 pm Stokes
I image, observed on 12-Sep-2006, MOMFBD restored based on 110 exposures per state. Panel b) shows the corresponding MOMFBD
restored stokes V image. Panel c) is a Stokes V image constructed
from the flat-fielded data. Panels b) and c) have the same scaling,
-0.2 to 0.2. The graph in panel d) shows power spectra of part of
the MOMFBD restored wide-band image (solid line), the MOMFBD
restored Stokes I image (dotted), and the flat-fielded Stokes I
image (dash-dotted line). The vertical long-dashed line marks the
theoretical diffraction limit ![]() ![]() |
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Figure 9: Scatter plots of relative difference comparing Stokes V magnetograms restored with different number of wavefront modes. Panel a) compares a 2-mode with a 34-mode restoration, b) compares a 256-mode with a 34-mode restoration. For the densest scatter regions, density contours are plotted to avoid crowding. |
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Figure 10: Dark-cored penumbral filaments observed in two sunspots. Top two rows: AR 10908 on 12 Sep. 2006, bottom rows: AR 10908 on 15 Sep. 2006, with the center-side penumbra on the third row, and the limb-side penumbra on the bottom row. Left to right: maps of Stokes I in +5 pm, total circular polarization, total linear polarization, total polarization, and the ratio of total circular over linear polarization. The arrow in the Stokes I images points towards the center of the solar disk. |
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Figure 11:
Faculae observed on 7 Jan. 2006. The left column shows Stokes
maps at -5 pm, the middle column at +5 pm. The Stokes maps Q/I, U/I,
V/I saturate at ![]() ![]() |
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