Instrument | |
Instrument Name: | ZIMPOL-3 |
Telescope: | IRSOL-Gregory-Coudé |
Telescope Aperture: | 45 cm |
Telescope Port: | Gregory-Coudé |
Status: | Operational |
Commissioning Date: | 2009 |
Polarimetry: | |
Polarimetry Type: | Imaging Spectropolarimetry, Full Stokes |
Stokes Parameters: | I Q U V |
Wavelength Range: | 320 nm to about 1000 nm |
Modulator Type: | FLC |
Modulator Type Other: | PEM or FLC |
Modulation Frequency: | 42 kHz,PEM and 1 kHz, FLC |
Analyzer Type: | Cube Beam-Splitter |
Analyzer Type Other: | |
Sensitivity: | >10^-5 |
Accuracy Zero Point: | ~2*10^-4 (work in progress to improve it) |
Accuracy Scaling: | |
Imaging: | Yes |
Wavelength Range: | 390–660 nm (depends on the Fabry Perot) |
Field of View: | ~ 140" x 170" |
Resolution: | Resolution: >1"*2.5", |
Pixel Scale: | (1240 x (140x4)) |
Pixel Dimensions: | 22.5mu x (4 *22.5) mu |
Sensor Type: | CCD, masked and with microlenses) |
Limiting Magnitude: | |
Coronograph: | No |
Coronograph Type: | |
Coronograph IWA: | |
Adaptive Optics: | Yes |
DM, Number of Actuators: | 37 |
DM Type: | Okotech |
WFS Type: | Shack-Hartmann |
WFS Update frequency: | 1kHz |
Strehl: | |
Limiting Magnitude: | |
Spectroscopy: | Yes |
Sampling: | ~1 Hz |
Wavelength Range: | ~350 - 900 nm |
Spectral Resolution: | 900'000 |
Limiting Magnitude: | |
Instrument Image: | |
Instrument Image Caption: | Zimpol-3 camera at the focal plane of the spectrograph |
Instrument Reference Paper: | "ZIMPOL-3: a powerful solar polarimeter", R. Ramelli, S. Balemi, M. Bianda, I. Defilippis, L. Gamma, S. Hagenbuch, M. Rogantini, P. Steiner and J. O. Stenflo: 2010, SPIE conference proceedings, SPIE conference on Astronomical Telescopes + Instrumentation in San Diego, USA, 27 June - 2 July 2010, Vol. 7735, 77351Y, doi: 10.1117/12.857120 http://www.irsol.ch/Papers/zimpol_spie10.pdf |
Known Issues: | based on microlenses technology. Not suitable for very large sensors |
Instrument Contact: | Daniel Gisler, Renzo Ramelli |
Instrument Website: | |
Planned Upgrades: | digital and hardware redesign |
Science | |
Science Description: | Solar Spectropolarimetry. Measurement of magnetic fields in the solar photosphere, chromosphere and prominences. |
Target Types: | Sun |
Sample Image/Result: | |
Sample image Caption: | Stokes spectra measured near the North limb about 6 arcseconds inside the disk. The Cr I 5206 Å triplet shows the scattering polarization profile reported in the plots on the left. Faint Zeeman signatures can be seen in the V/I image (about 0.1 % peak to peak amplitude). On the left a profile as measured on one of the 140 raw in the spatial direction (middle panel) and averaged along the spatial direction over 60 pixel. More on the paper of Smitha et al, 2014, ApJ, 794, 30 |
Sample Science Papers: | "The quantum interference effects in the Sc II 4247 A line of the Second Solar Spectrum", H. N. Smitha, K. N. Nagendra, J. O. Stenflo, M. Bianda, R. Ramelli: 2014, The Astrophysical Journal, 794, 30 "Center to limb observations and modeling of the Ca I 4227 Å line", H. D. Supriya, H. N. Smitha, K. N. Nagendra, J. O. Stenflo, M. Bianda, R. Ramelli, B. Ravindra, and L. S. Anusha: 2014, The Astrophysical Journal, 793, 42 "Calibration of the 6302/6301 Stokes V line ratio in terms of the 5250/5247 ratio", J.O. Stenflo, M.L. Demidov, M. Bianda, R. Ramelli: 2013 Astronomy and Astrophysics, 556, A113 "J-state interference signatures in the second solar spectrum. Modeling the Cr i triplet at 5204-5208 Å", H. N. Smitha, K. N. Nagendra, J. O. Stenflo, M. Bianda, M. Sampoorna, R. Ramelli, L. S. Anusha: 2012, Astronomy and Astrophysics, 541, A24 "Observations of forward Scattering Hanle Effect in the Ca I 4227 Å Line", M. Bianda, R. Ramelli, J.O. Stenflo , K.N. Nagendra, L.S. Anusha, R. Holzreuter, M. Sampoorna, H. Frisch and H.N. Smitha: 2011, Astronomy and Astrophysics, 530, L13 DOI: 10.1051/0004-6361/201117047 "Analysis of the forward Scattering Hanle Effect in the Ca I 4227 Å Line", L.S. Anusha, K.N. Nagendra, M. Bianda, J.O. Stenflo , R. Holzreuter, M. Sampoorna, H. Frisch, R. Ramelli and H.N. Smitha: 2011, The Astrophysical Journal, 737, 95 "NLTE modeling of Stokes vector center-to-limb variations in the CN violet system", A. I. Shapiro, D. M. Fluri, S. V. Berdyugina, M. Bianda, and R. Ramelli: 2011, Astronomy and Astrophysics,529, A139 "First successful deployment of the ZIMPOL-3 system at the GREGOR telescope", Renzo Ramelli, Daniel Gisler, Michele Bianda, Nazaret Bello González, Svetlana Berdyugina, Dirk Soltau: 2014, SPIE proceedings Vol. 9147, 91473G, SPIE conference on Astronomical Telescopes + Instrumentation 2014 in Montréal, Quebec, Canada, 22-27 June 2014. "Exploring the magnetic fields of solar prominences and spicules via He I D3 spectropolarimetry", R. Ramelli , J. Trujillo Bueno, M. Bianda, and A. Asensio Ramos: 2011, Proceedings of the 6.th Solar Polarization Workshop (SPW6), Haleakala Maui, US, May 30 - June 4 2010, (ASP conference series, 437, 109) "Observations of the solar Ca I 4227 Å line", M. Bianda, R. Ramelli, J.O. Stenflo , L.S. Anusha, K.N. Nagendra, M. Sampoorna, R. Holzreuter, H. Frisch: 2011, Proceedings of the 6.th Solar Polarization Workshop (SPW6), Haleakala Maui, US, May 30 - June 4 2010, (ASP conference series, 437, 67) |
Remarks: |