Estimation of the Eclipse Solar Radius by Flash Spectrum Video Analysis
Luca Quaglia, John Irwin, Konstantinos Emmanouilidis, Alessandro, Pessi
TL;DR
This paper accurately estimated the solar radius during the 2017 eclipse using flash spectrum videos, combining observational data with precise simulations of limb darkening and lunar-solar limb movements.
Contribution
It introduces a novel method of estimating the solar radius from eclipse flash spectra through detailed light curve analysis and simulation comparison.
Findings
Solar radius during 2017 eclipse: 959.95 arcseconds at 1 AU
No significant wavelength dependence observed
Method achieves high measurement precision
Abstract
The value of the eclipse solar radius during the 2017 August 21 total solar eclipse was estimated to be at with no significant dependence on wavelength. The measurement was obtained from the analysis of a video of the eclipse flash spectrum recorded at the southern limit of the umbral shadow path. Our analysis was conducted by extracting light curves from the flash spectrum and comparing them to simulated light curves. Simulations were performed by integrating the limb darkening function (LDF) over the exposed area of photosphere. These numerical integrations relied upon very precise computations of the relative movement of the lunar and solar limbs.
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