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

0

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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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