Spectropolarimetry with the green line: Observations and Simulations A. Bemporad INAF-Osservatorio...
27
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
Spectropolarimetry with the green line: Observations and Simulations A. Bemporad INAF-Osservatorio Astrofisico di Torino, Italy 1 ISSI Team on “Coronal
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
Slide 2
OUTLINE Introduction: LCTP for the green line
Spectropolarimetric observations during the 2010 TSE Simulation of
green line polarized emission 2
Slide 3
LCTP CALIBRATION 3 (in collaboration with L. Abbo, G.
Capobianco, S. Fineschi, G. Massone)
Slide 4
4 Liquid-crystal Tunable Lyot Filter for Solar
Coronagraphy
Slide 5
Slide 6
LCTP Perfomances 6
Slide 7
FE XIV 530.3 SPECTROPOLARIMETRY: OBSERVATIONS 7 (in
collaboration with L. Abbo, C. Benna, P. Calcidese, G. Capobianco,
S. Fineschi, G. Massone, M. Romoli)
Slide 8
The CorMag was operated during the total solar eclipse of July,
11th 2010 on Tatakoto Atoll (French Polynesia) 8
Slide 9
9 2010 TSE CORONAL CONFIGURATION K-corona image (filtered) by
M. Druckmuller
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.
Slide 12
12 2010 TSE CORMAG & EKPOL DATA LASCO/C2 + EKPolCorMag
FeXIV + EIT 304
Slide 13
13 LCTP SCAN
Slide 14
CORMAG RESULTS 14 FeXIV line intensityFeXIV line doppler
shifts
Slide 15
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)
Slide 16
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)
Slide 17
17 COMP-S INSTRUMENT @ LOMNICKY STIT OBSERVATORY (SLOVAK
R.)
Slide 18
18 LCTP FILTER @ CLIMSO CORONAGRAPH PIC DU MIDI (FRANCE)?
Slide 19
19 FE XIV 530.3 SPECTROPOLARIMETRY: SIMULATIONS (in
collaboration with L. Abbo, L. Belluzzi, R. Casini, S. Fineschi, P.
Judge)
Slide 20
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
Slide 21
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
Slide 22
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
Slide 23
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
Slide 24
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
Slide 25
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
Slide 26
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
Slide 27
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
