Preliminary design of the visible spectro-polarimeter for the Advanced Technology Solar Telescope

Alfred G. de Wijn; Roberto Casini; Peter G. Nelson; Pei Huang

doi:10.1117/12.926497

24 September 2012 Preliminary design of the visible spectro-polarimeter for the Advanced Technology Solar Telescope

Alfred G. de Wijn, Roberto Casini, Peter G. Nelson, Pei Huang

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 84466X (2012) https://doi.org/10.1117/12.926497
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The Visible Spectro-Polarimeter (ViSP) is one of the first light instruments for the Advanced Technology Solar Telescope (ATST). It is an echelle spectrograph designed to measure three different regions of the solar spectrum in three separate focal planes simultaneously between 380 and 900 nm. It will use the polarimetric capabilities of the ATST to measure the full Stokes parameters across the line profiles. By measuring the polarization in magnetically sensitive spectral lines the magnetic field vector as a function of height in the solar atmosphere can be obtained, along with the associated variation of the thermodynamic properties. The ViSP will have a spatial resolution of 0.04 arcsec over a 2 arcmin field of view (at 600 nm). The minimum spectral resolving power for all the focal planes is 180,000. The spectrograph supports up to 4 diffraction gratings and is fully automated to allow for rapid reconfiguration.

Citation Download Citation

Alfred G. de Wijn, Roberto Casini, Peter G. Nelson, and Pei Huang "Preliminary design of the visible spectro-polarimeter for the Advanced Technology Solar Telescope", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84466X (24 September 2012); https://doi.org/10.1117/12.926497

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