Spectro-Polarimetry in the Era of Large Solar Telescope

TL;DR

This paper examines the challenges and trade-offs in spectro-polarimetric observations with large solar telescopes, emphasizing the need for multi-wavelength tunable filters and 2D field of view grating spectrographs.

Contribution

It highlights the specific instrumental requirements for future large solar telescopes to optimize spectro-polarimetric observations.

Findings

Tunable filters should have multi-wavelength capability.

Grating spectrographs need a 2D field of view.

Trade-offs among resolution, cadence, and SNR are essential considerations.

Abstract

This paper discusses some of the challenges of spectro-polarimetric observations with a large aperture solar telescope such as the ATST or the EST. The observer needs to reach a compromise among spatial and spectral resolution, time cadence, and signal-to-noise ratio, as only three of those four parameters can be pushed to the limit. Tunable filters and grating spectrographs provide a natural compromise as the former are more suitable for high-spatial resolution observations while the latter are a better choice when one needs to work with many wavelengths at full spectral resolution. Given the requirements for the new science targeted by these facilities, it is important that 1)tunable filters have some multi-wavelength capability; and 2)grating spectrographs have some 2D field of view.