Image Quality Specification for Solar Telescopes
Saraswathi Kalyani Subramanian, Sridharan Rengaswamy

TL;DR
This paper proposes using rms granulation contrast as a new metric to quantify image quality in ground-based solar telescopes, addressing limitations of traditional metrics like the Strehl ratio.
Contribution
It introduces a novel approach to measure solar telescope image quality using rms granulation contrast and provides a relationship with the Strehl ratio for various telescope and atmospheric conditions.
Findings
Established a semi-logarithmic relationship between Strehl ratio and rms contrast.
Estimated adaptive optics system efficiencies based on simulations.
Predicted lower bounds on image quality for ground-based solar telescopes.
Abstract
Modern large ground-based solar telescopes are invariably equipped with adaptive optics systems to enhance the high angular resolution imaging and spectroscopic capabilities in the presence of the Earth's atmospheric turbulence. The quality of the images obtained from these telescopes can not be quantified with the Strehl ratio or other metrics that are used for nighttime astronomical telescopes directly. In this paper, we propose to use the root mean square (rms) granulation contrast as a metric to quantify the image quality of ground-based solar telescopes. We obtain semi-logarithmic plots indicating the correspondence between the Strehl ratio and the rms granulation contrast for most practical values of the telescope diameters (D) and the atmospheric coherence diameters (), for various levels of adaptive optics compensation. We estimate the efficiency of a few working solar…
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Taxonomy
TopicsAdaptive optics and wavefront sensing · Solar Radiation and Photovoltaics · Advanced Image Processing Techniques
