Electrooptical Spectropolarimeter for Ground and Spacebased Solar Coronagraphy

Electro-optical Spectro-polarimeter for Ground- and Space-based Solar Coronagraphy S. Fineschi, INAF-Osservatorio Astronomico di Torino, Italy May 9 th, 2012 - MP 1104 COST Action 1 st WG meeting, Warsaw 1

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 2

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 3

ASPIICS LC Lyot filter 4

Liquid-crystal Tunable Lyot Filter for Solar Coronagraphy 5

LC Tunable-filter & Polarimeter Procurement

LCTP Perfomances 7

SET-UP @ TURIN ASTRONOMICAL OBS. LAB Monochr. slit width= Monochr. spectrum= Collim. lens (L 1) f = Camera lens (L 2) f = CCD pixel sixe = Spatial scale = 25 µm; height = 6 mm CW 530. 3 nm; FWHM = 0. 1 nm 140 mm 1130 mm 25 5 arcsec/pix (ASPIICS: 3 arcsec/pix) 8

LCTP SPECTRAL TESTS 9

0° 90° 45° 135° 10

LC SPACE VALIDATION (RAD-HARDNESS) Proba-3 rad-hard requirement (Summary Mission Requirements: ESA P 3 -EST-TN-7002) • 1996 – 1. 5 Mrad of < 32 Me. V e- (Graham et al. , SPIE 2811) • 1998 – 12 krad of 20 Me. V 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 Me. V p+, 10 Me. V e. ESA-ITT “LC Space Validation for Sol. O” 11

The Cor. Mag was operated during the total solar eclipse of July, 11 th 2010 on Tatakoto Atoll (French Polynesia) 12

LCTP BASED SPECTROPOLARIMETER–CORMAG 13

CORONAL TEMPERATURE CONTOUR LEVELS: BLUE: 1. 5 106 K GREEN: 2 106 K K-corona image by M. Drukmuller 14

HAO Co. MP LC Lyot filter & Polarimeter Fe. XIII 1074. 7 nm S. Tomczyk, et al. Science 317, 1192 (2007); 15

COMP observations. HAO model. S. Gibson courtesy, 2012 16

COMP-S INSTRUMENT @ LOMNICKY PEAK OBSERVATORY (SLOVAK R. ) 17

LCTP FILTER @ CLIMSO CORONAGRAPH PIC DU MIDI (FRANCE)? 18

LCTP FILTER & ASPIICS TELESCOPE @ DOMEC FRENCH-ITALIAN CONCORDIA BASE (ANTARTICA)? Sky Brightness Monitor @ Concordia J. Arnaud, M. Faroubert, 2009 ESCAPE proposal L. Dame, 2011 19

Thanks !!! 20

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: üno mechs, üsome science preserved even in “fail state”, üOPS monitoring capability also during coronal images acquisition 21 Aug. , 2011 - Solar Physics and Space Weather Instrumentation IV – San Diego , CA 21

SET-UP @ OATO LAB 22

Monochromator setting Center wavel. : 530. 3 nm FWHM: 0. 1 nm exit slit 0 -d 0 0 +d 23

LCTP VS. F-P ETALON SPECTROSCOPY 21 Aug. , 2011 - Solar Physics and Space Weather Instrumentation IV – San Diego , CA 24

LC Tunable-filter 25

Liquid-crystal Tunable Lyot Filter for Solar Coronagraphy LCTP AND F-P CHARACTERISTICS 21 Aug. , 2011 - Solar Physics and Space Weather Instrumentation IV – San Diego , CA 26