electro-optical spectro-polarimeter for ground- and space-based solar coronagraphy
DESCRIPTION
Electro-optical Spectro-polarimeter for Ground- and Space-based Solar Coronagraphy S. Fineschi, INAF-Osservatorio Astronomico di Torino, Italy. Proba-3: ESA Formation-flying space coronagraph LC Tunable-filter Polarimeter (LCTP) for the “green line” LCTP Lab performances evaluation - PowerPoint PPT PresentationTRANSCRIPT
Electro-optical Spectro-polarimeter for Ground- and Space-based
Solar Coronagraphy S. Fineschi,
INAF-Osservatorio Astronomico di Torino, Italy
1May 9th, 2012 - MP1104 COST Action 1st WG meeting, Warsaw
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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LC Lyot filter
ASPIICS
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Liquid-crystal Tunable Lyot Filter for Solar Coronagraphy
LC Tunable-filter & Polarimeter Procurement
LCTP Perfomances
Long Scan
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5
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35
526 527 528 529 530 531 532 533 534 535
Wavelength(nm)
Tra
ns
mis
sio
n(%
)
Prefilter
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
527 528 529 530 531 532 533 534 535
Wavelength (nm)
Tra
nsm
issi
on
Fine Tuning
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529 529.5 530 530.5 531 531.5
Wavelength (nm)
Tra
ns
mis
sio
n (
%)
530.3
530.32
530.34
530.36
Temperature Dependence
0
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529 529.2 529.4 529.6 529.8 530 530.2 530.4 530.6 530.8 531
Wavelength (nm)
Tra
ns
mis
sio
n (
AU
)
21.4 Deg. C
25.9 Deg. C
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SET-UP @ TURIN ASTRONOMICAL OBS. LABMonochr. slit width= 25 µm; height = 6 mmMonochr. spectrum= CW 530.3 nm; FWHM = 0.1nmCollim. lens (L1) f = 140 mmCamera lens (L2) f = 1130 mmCCD pixel sixe = 25Spatial scale = 5 arcsec/pix (ASPIICS: 3 arcsec/pix)
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LCTP SPECTRAL TESTS
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0°
90°
45°
135°
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Proba-3 rad-hard requirement (Summary Mission Requirements: ESA P3-EST-TN-7002)
•1996 – 1.5 Mrad of < 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”
LC SPACE VALIDATION (RAD-HARDNESS)
The CorMag was operated during the total solar eclipse of July, 11th 2010 on Tatakoto Atoll (French Polynesia)
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LCTP BASED SPECTROPOLARIMETER–CORMAG
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CORONAL TEMPERATURE
CONTOUR LEVELS:
BLUE: 1.5106 KGREEN: 2106 K
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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 @ LOMNICKY PEAK OBSERVATORY (SLOVAK R.)
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LCTP FILTER @ CLIMSO CORONAGRAPH PIC DU MIDI (FRANCE)?
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LCTP FILTER & ASPIICS TELESCOPE
@ DOMEC FRENCH-ITALIAN CONCORDIA BASE (ANTARTICA)?
Sky Brightness Monitor @ ConcordiaJ. Arnaud, M. Faroubert, 2009
ESCAPE proposal L. Dame, 2011
Thanks !!!
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•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
2121 Aug., 2011 - Solar Physics and Space Weather Instrumentation IV – San Diego , CA
Liquid-crystal Tunable Lyot Filter for Solar Coronagraphy
SET-UP @ OATO LAB
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0 -d0
0 +d
exit slit
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Monochromator settingCenter wavel.: 530.3 nmFWHM: 0.1 nm
LCTP VS. F-P ETALONSPECTROSCOPY
2421 Aug., 2011 - Solar Physics and Space Weather Instrumentation IV – San Diego , CA
LC Tunable-filter
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LCTP AND F-P CHARACTERISTICS
2621 Aug., 2011 - Solar Physics and Space Weather Instrumentation IV – San Diego , CA
Liquid-crystal Tunable Lyot Filter for Solar Coronagraphy
LCTP BASED SPECTROPOLARIMETER - CORMAG
2721 Aug., 2011 - Solar Physics and Space Weather Instrumentation IV – San Diego , CA
LCTP BASED SPECTROPOLARIMETER–CORMAG
2821 Aug., 2011 - Solar Physics and Space Weather Instrumentation IV – San Diego , CA
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