spectropolarimetry with the green line: observations and simulations a. bemporad inaf-osservatorio...
TRANSCRIPT
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- Spectropolarimetry with the green line: Observations and Simulations A. Bemporad INAF-Osservatorio Astrofisico di Torino, Italy 1 ISSI Team on Coronal Magnetometry, First Meeting, 24/02-01/03/2013, Bern
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- OUTLINE Introduction: LCTP for the green line Spectropolarimetric observations during the 2010 TSE Simulation of green line polarized emission 2
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- LCTP CALIBRATION 3 (in collaboration with L. Abbo, G. Capobianco, S. Fineschi, G. Massone)
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- 4 Liquid-crystal Tunable Lyot Filter for Solar Coronagraphy
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- LCTP Perfomances 6
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- FE XIV 530.3 SPECTROPOLARIMETRY: OBSERVATIONS 7 (in collaboration with L. Abbo, C. Benna, P. Calcidese, G. Capobianco, S. Fineschi, G. Massone, M. Romoli)
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- The CorMag was operated during the total solar eclipse of July, 11th 2010 on Tatakoto Atoll (French Polynesia) 8
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- 9 2010 TSE CORONAL CONFIGURATION K-corona image (filtered) by M. Druckmuller
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- 10 2010 TSE CORONAL CONFIGURATION SOHO/LASCO C2 run.diff.SDO/AIA 171
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- 11 2010 TSE CORMAG DATA 1024X1024 pix, 16 bit/pix, 2MB per image, pix 24um, 6.2/pix 31 exposures (exptime 8 sec): 21, 5 and 5 with pol. angles 0, 60 and 120 resp.
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- 12 2010 TSE CORMAG & EKPOL DATA LASCO/C2 + EKPolCorMag FeXIV + EIT 304
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- 13 LCTP SCAN
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- CORMAG RESULTS 14 FeXIV line intensityFeXIV line doppler shifts
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- CORMAG RESULTS 15 FeXIV line widths ( ) (after deconvolution with Lyot filter instrumental profile) Prasad et al. (2013) Fe 13+ ions kinetic temperatures Habbal et al. (2010)
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- FE 13+ KINETIC TEMPERATURE CONTOUR LEVELS: BLUE: 1.5 10 6 K GREEN: 3.0 10 6 K RED : 4.5 10 6 K 16 K-corona image by M. Drukmuller Pasachoff et al. (2011)
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- 17 COMP-S INSTRUMENT @ LOMNICKY STIT OBSERVATORY (SLOVAK R.)
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- 18 LCTP FILTER @ CLIMSO CORONAGRAPH PIC DU MIDI (FRANCE)?
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- 19 FE XIV 530.3 SPECTROPOLARIMETRY: SIMULATIONS (in collaboration with L. Abbo, L. Belluzzi, R. Casini, S. Fineschi, P. Judge)
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- 20 Simulations of FeXIV green line polarized emission: performed with the numerical code originally developed by P. G. Judge and R. Casini for forbidden lines (see Casini & Judge 1999; Judge & Casini 2001). Lines assumed to be optically thin, excited by (anisotropic) photospheric radiation + thermal particle collisions. Assuming that collisional excitation is isotropic collisional component is unpolarized collisional depolarization. Scattering redistribution function P is proportional to ~ sin 2 (a 2 + b 2 cos 2 ) with and angles between the field and the direction of the incident and scattered radiation, -a 2 / b 2 = 1/3 VV ~ 54.6 (House 1977). Direction of linear polarization projected direction of POS magnetic field, but polarization changes sign at VV ambiguity by 90. THE SIMULATION
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- 21 FIRST TEST: CENTERED DIPOLE, NO LOS INTEGRATION (dipolar field, isothermal corona at 2 10 6 K, density profile from Antonucci et al. (2006) for streamer c.hole interface) Q/I (%) + B = VV B = /4
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- 22 FIRST TEST: CENTERED DIPOLE, NO LOS INTEGRATION (dipolar field, isothermal corona at 2 10 6 K, density profile from Antonucci et al. (2006) for streamer c.hole interface) |U|/I (%) + B = VV, VV B = k/2
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- 23 (dipolar field, isothermal corona at 2 10 6 K, density profile from Antonucci et al. (2006) for streamer c.hole interface) Q/I (%) + B = VV B = /4 SECOND TEST: CENTERED DIPOLE, LOS INTEGRATION
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- 24 (dipolar field, isothermal corona at 2 10 6 K, density profile from Antonucci et al. (2006) for streamer c.hole interface) |U|/I (%) + B = VV, VV B = k/2 SECOND TEST: CENTERED DIPOLE, LOS INTEGRATION
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- 25 (dipolar field, isothermal corona at 2 10 6 K, density profile from Antonucci et al. (2006) for streamer c.hole interface) Q/I (%) + THIRD TEST: SHIFTED DIPOLE, LOS INTEGRATION
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- 26 (dipolar field, isothermal corona at 2 10 6 K, density profile from Antonucci et al. (2006) for streamer c.hole interface) |U|/I (%) + THIRD TEST: SHIFTED DIPOLE, LOS INTEGRATION
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- 27 [dipolar field, isothermal corona at 2 10 6 K, density profile from Antonucci et al. (2006) for streamer c.hole interface + loop at 10 9 cm -3 from Ugarte-Urra et al. (2005)] FOURTH TEST: CENTERED DIPOLE, LOS INTEGRATION, LOOP DENSITY