Presentacin de PowerPoint

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Image Quality in SUNRISE
Sunrise Team Meeting Freiburg, Sept. 1-3, 2004
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True object
Model of solar granulation in continuum
(200G) Pixel size 0.0287 Nyquist Freq.
1./0.0575 arcsec-1
Courtesy M.Schüssler
7.3
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Diffractional effects at continuum
(images are grey-scaled individually)
Courtesy M. Schüssler
Ø50 cm
Diffr.limit 0.2166
true object
observed images
Ø100 cm
7.3
Diffr.limit 0.1083
Continuum ?525 nm (0.0287/pix)
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Diffractional effects at continuum
(images with common grey scale)
Courtesy M. Schüssler
Ø50 cm
Diffr.limit 0.2166
true object
observed images
Ø100 cm
7.3
Diffr.limit 0.1083
Continuum ?525 nm (0.0287/pix)
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Simulations of degradation by figure errors in
the focal plane of IMAX
Noise and ripple are not considered
Defocus
Figure errors fS aj Zj , (j4,....,15)
aj chosen to have random values ranging -1,1,
and then rescaled to meet the desired wave front
aberration frms
Number of realizations per simulation 200 Size
of the resulting field of view 7.3 x 7.3
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Simulations of degradation by figure errors in
the focal plane of IMAX
IMAX parameters
D 1 m central obscuration0.23 Cutoff
frequency 1/0.1083 arcsec-1 Amount of
aberration considered frms l/5, l/7, l/10,
l/14
Solar-B parameters
D 0.5 m central obscuration0.23 Cutoff
frequency 1/0.2166 arcsec-1 Estimated amount of
aberration frms l/18
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SUNRISE vs. Solar-B
Ø f_ rms Strehl (cm) (waves)
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SUNRISE vs. Solar-B
Ø f_ rms Strehl (cm) (waves)
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SUNRISE vs. Solar-B
frmsl/5
Ø f_ rms Strehl (cm) (waves)
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(images with individual grey scale)
Ø100 diffr.limited
Contr. 0.162
Ø50, rms?/18
Ø100, rms?/5
Ø100, rms?/5
Worst contrast
Best contrast
Contr. 0.104 Contr. 0. 110
Contr. 0.101
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SUNRISE vs. Solar-B
frmsl/7
Ø f_ rms Strehl (cm) (waves)
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(images with individual grey scale)
Ø100 diffr.limited
Contr. 0.162
Ø100, rms?/7
Ø100, rms?/7
Ø50, rms?/18
Best contrast
Worst contrast
Contr. 0.115 Contr.
0.110 Contr. 0.111
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SUNRISE vs. Solar-B
frmsl/10
Ø f_ rms Strehl (cm) (waves)
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(images with individual grey scale)
Ø100 diffr.limited
Contr. 0.162
Ø100, rms?/10
Ø50, rms?/18
Ø100, rms?/10
Contr. 0.122 Contr.
0.110 Contr. 0.121
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SUNRISE vs. Solar-B
frmsl/14
Ø f_ rms Strehl (cm) (waves)
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(images with individual grey scale)
Ø100 diffr.limited
Contr. 0.162
Ø100, rms?/14
Ø50, rms?/18
Ø100, rms?/14
Contr. 0.129 Contr.
0.110 Contr. 0.125
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Aberration description with global parameters
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Error budget
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