A paper by BSI senior scientist Dr. Germar Bernhard titled "Measurements of spectral irradiance during the solar eclipse of 21 August 2017: reassessment of the effect of solar limb darkening and of changes in total ozone" was published by Atmospheric Measurement Techniques Discussions today. The paper is currently under reivew and is available here.
The research is based on measurements with a GUVis-3511 radiometer during the total solar eclipse of 21 August 2017. Data were used to study the wavelength-dependent changes of solar radiation at Earth’s surface and to validate parameterizations of solar limb darkening (LD), which describes the change of the Sun’s brightness between its center and its edge. The study highlights the importance of the LD effect when calculating total ozone and aerosol optical depth during an eclipse.