A portable S-DIMM developed for preliminary measurement of seeing for Solar Site Survey: Theory and one case study

Duan, Xiao-Mei; Liu, Yu; Song, Teng-Fei; Zhu, Feng-Rong

doi:10.1016/j.newast.2024.102206

Cited by 1 publication

(1 citation statement)

References 13 publications

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“…Our method can be employed to extract the diameter of the solar disk from individual images. This approach enables a direct and expeditious estimation of the site's seeing parameter r 0 by analyzing variations in the measured solar diameters, as illustrated in a recent paper by Duan et al (2024). It eliminates the need for time-consuming data reduction processes, extensive computational resources, or additional investments in instrumentation.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Solar Image Quality Assessment: A Proof of Concept Using Variance of Laplacian Method and its Application to Optical Atmospheric Condition Monitoring

So,

Yuen,

Leung

et al. 2024

PASP

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Here we present a proof of concept for the application of the Variance of Laplacian (VL) method in quantifying the sharpness of optical solar images. We conducted a comprehensive study using over 65,000 individual solar images acquired on more than 160 days. Each image underwent processing using a VL image processing algorithm, which assigns a “score” based on the sharpness of the solar disk’s edges. We studied the scores obtained from images acquired at different conditions. Our findings demonstrate that the sharpness of the images exhibits daily trends that are closely linked to the altitude of the Sun at the observation site. We observed a significant degradation in image quality only below a certain altitude threshold. Furthermore, we compared airmass formulae from the literature with our sharpness observations and concluded that the degradation could be modeled as an Image Sharpness Function (ISF), which exhibits similarities to airmass variations. In addition to assessing image quality, our method has the potential to evaluate the optical atmospheric conditions during daytime observations. Moreover, this technique can be easily and cost-effectively applied to archival or real-time images of other celestial bodies, such as the Moon, bright planets and defocused stars. Given that ISF is unique to each location and sensitive to sky conditions, the development of an ISF is not only beneficial for routine observation preparation but also essential for long-term site monitoring.

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Section: Conclusion and Discussionmentioning

confidence: 99%