On the performance of a dual-beam polarimeter at Kodaikanal Tower Telescope

Details On the performance of a dual-beam polarimeter at Kodaikanal Tower Telescope On the performance of a dual-beam polarimeter at Kodaikanal Tower Telescope

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008basi...36...99n&link_type=abstract

Bulletin of the Astronomical Society of India, Vol. 36, No. 2, p. 99-110

Astronomy and Astrophysics

Astronomy

1

Instrumentation : Polarimeter

Scientific paper

Calibration and characterization of a dual-beam polarimeter installed at Kodaikanal Tower Telescope (KTT) for spectropolarimetric observations are presented in this paper. It was found that a slit width of 48 μ is optimum for the spectrograph setup at KTT and corresponding spectral resolution is 32.47 mÅ. It was demonstrated that the precision in polarization measurement can be achieved better than 0.1 % by increasing the exposure time. However, the polarimetric calibration accuracy is limited to 0.35 % for Stokes Q and U parameters and 0.2 % for Stokes V parameter, mainly due to the uncertainty in the retardance of the calibration retarder. A comparison of the magnetic field measurement between the Solar Optical Telescope (SOT) onboard Hinode and KTT for an active region was made and a good match was found after spatial smearing of Hinode/SOT measurements by 5.12''.

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