Measurements of seeing-induced crosstalk in tip–tilt corrected solar polarimetry

Harsh Mathur; K. Nagaraju; Hemanth Pruthvi; K. Sagaynathan

doi:10.1364/AO.519245

Applied Optics
Vol. 63,
Issue 15,
pp. 4088-4094
(2024)
•https://doi.org/10.1364/AO.519245

Measurements of seeing-induced crosstalk in tip–tilt corrected solar polarimetry

Harsh Mathur, K. Nagaraju, Hemanth Pruthvi, and K. Sagaynathan

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Harsh Mathur, K. Nagaraju, Hemanth Pruthvi, and K. Sagaynathan, "Measurements of seeing-induced crosstalk in tip–tilt corrected solar polarimetry," Appl. Opt. 63, 4088-4094 (2024)

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Abstract

We present measurements of seeing-induced crosstalk using spectropolarimetric observations of sunspots recorded simultaneously in the ${\rm{H}}\;\alpha$ and Ca ii 8662 Å lines with the Kodaikanal Tower Tunnel (KTT) telescope. The Kodaikanal Tower Tunnel telescope is integrated and installed with an image stabilization system consisting of a tip–tilt and an autoguider system. Additionally, the spectropolarimeter at KTT is upgraded to allow for the simultaneous recording of spectropolarimetric observations in three spectral lines. The tip–tilt system is shown to have a cutoff frequency of 80 Hz, effectively reducing the seeing induced crosstalk in the measured Stokes parameters by at least a factor of 2.

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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Line	Term	Uncorrected Mean	Corrected Mean	Uncorrected rms	Corrected rms
$H α$	$I \to Q$	0.012	0.004	0.018	0.005
$H α$	$I \to U$	0.013	0.005	0.019	0.007
$H α$	$I \to V$	0.016	0.007	0.023	0.009
Ca ii 8662 Å	$I \to Q$	0.012	0.005	0.017	0.006
Ca ii 8662 Å	$I \to U$	0.007	0.004	0.011	0.005
Ca ii 8662 Å	$I \to V$	0.008	0.005	0.011	0.006

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Applied Optics