Polarimeter for the HELLRIDE instrument at Vacuum Tower Telescope

Hemanth Pruthvi; Markus Roth

doi:10.1117/12.2563619

13 December 2020 Polarimeter for the HELLRIDE instrument at Vacuum Tower Telescope

Hemanth Pruthvi, Markus Roth

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 11447AM (2020) https://doi.org/10.1117/12.2563619
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

Vacuum Tower Telescope is a 70 cm off-axis solar telescope situated at Teide Observatory, Tenerife. It hosts a suit of instruments including HELioseismic Large Region Interferometric DEvice (HELLRIDE). HELLRIDE is a dual Fabry-P´erot etalon-based imaging spectroscopic instrument. It records solar activity at multiple heights by means of multi-line spectroscopy with a cadence of less than a minute. Polarimeter development for the aforementioned instrument is discussed, towards producing the magnetograms at high cadence. Liquid crystal variable retarders and Polarizing beam-splitter are chosen as polarimetric modulators and analyzer respectively. A broadband imager is designed to acquire continuum images at the same time as polarized images. Two spectral lines are selected for the polarimetric observations: Fe i 6302.5 Å and Ca ii 8542 Å, with a scope for adding more lines.

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Hemanth Pruthvi and Markus Roth "Polarimeter for the HELLRIDE instrument at Vacuum Tower Telescope", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 11447AM (13 December 2020); https://doi.org/10.1117/12.2563619

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