Diapositiva 1

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Electro-optical Spectro-polarimeter for Ground-
and Space-based Solar Coronagraphy S.
Fineschi, INAF-Osservatorio Astronomico di
Torino, Italy
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OUTLINE

• Proba-3 ESA Formation-flying space coronagraph
• LC Tunable-filter Polarimeter (LCTP) for the
  green line
• LCTP Lab performances evaluation
• Eclipse 2010 observations with LCTP prototye
• Case for ground-based emission-line coronagraphy
  in Europe

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ESA PROBA-3 (ESA Startiger 2009-10 Phase-A)
Formation-Flying Coronagraph
A coronagraph with the external occulter on one
spacecraft and the optical instrument on the
other spacecraft at 150 meters from the first
one.
Proba-3 ESA launch 2017. ASPIICS 2009
selection 2010 Phase-A (Startiger) 2012 Phase-B
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ASPIICS
LC Lyot filter
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Liquid-crystal Tunable Lyot Filter for Solar
Coronagraphy
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LC Tunable-filter Polarimeter Procurement
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LCTP Perfomances
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SET-UP _at_ TURIN Astronomical Obs. LAB
Monochr. slit width 25 µm height 6
mm Monochr. spectrum CW 530.3 nm FWHM
0.1nm Collim. lens (L1) f 140 mm Camera lens
(L2) f 1130 mm CCD pixel sixe 25? Spatial
scale 5 arcsec/pix (ASPIICS 3 arcsec/pix)
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LCTP SPECTRAL tests
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0
45
90
135
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LC SPACE VALIDATION (rad-hardness)

• Proba-3 rad-hard requirement
• (Summary Mission Requirements ESA
  P3-EST-TN-7002)
• 1996 ? 1.5 Mrad of lt 32 MeV e- (Graham et al.,
  SPIE 2811)
• 1998 ? 12 krad of ? 20 MeV protons (Noto et
  al., Opt. Eng.)
• 2007 ? 50 krad of ?-rad Thermal-vac Vibe
  tests
• (Heredero et al., Appl. Opt. 46)
• 2009-2010 ? 50 krad 100 MeV p, 10 MeV e-
• ESA-ITT LC Space Validation for SolO

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The CorMag was operated during the total solar
eclipse of July, 11th 2010 on Tatakoto Atoll
(French Polynesia)
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LCTP based spectropolarimetercormag
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Coronal Temperature contour levelsBlue
1.5?106 Kgreen 2?106 K
K-corona image by M. Drukmuller
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HAO CoMP LC Lyot filter Polarimeter FeXIII
1074.7 nm
S. Tomczyk, et al. Science 317, 1192 (2007)
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COMP observations. HAO model . S. Gibson
courtesy, 2012
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CoMP-S instrument _at_ Lomnicky Peak Observatory
(SLOVAK R.)
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LCTP FILTER _at_ CLIMSO CORONAGRAPH PIc du midi
(france)?
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LCTP FILTER ASPIICS telescope _at_ DOMEc
French-italian concordia base (antartica)?
Sky Brightness Monitor _at_ Concordia J. Arnaud, M.
Faroubert, 2009
ESCAPE proposal L. Dame, 2011
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Thanks !!!
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Liquid-crystal Tunable Lyot Filter for Solar
Coronagraphy

• The LCTP achieves all the spectroscopy
  performances expected from the F-P etalon
• The LCTP has additional science capabilities
  (e.g., polarimetry, simultaneous spectroscopy
  high-res imaging)
• ESA completed a LC space validation program
• The LCTP operational advantages
• no mechs,
• some science preserved even in fail state,
• OPS monitoring capability also during coronal
  images acquisition

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SET-UP _at_ OATo LAB
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Monochromator setting Center wavel. 530.3
nm FWHM 0.1 nm
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LCTP vs. F-P etalonSpectroscopy
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LC Tunable-filter
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LCTP and F-P Characteristics
Liquid-crystal Tunable Lyot Filter for Solar
Coronagraphy
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LCTP based SPECTRopolarimeter - cormag
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LCTP based spectropolarimetercormag
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